Year : 
2014
Title : 
Mathematics (Core)
Exam : 
JAMB Exam

Paper 1 | Objectives

11 - 20 of 47 Questions

# Question Ans
11.

Factorize 2y2 - 15xy + 18x2

A. (2y - 3x) (y + 6x)

B. (2y - 3x) (y - 6x)

C. (2y + 3x) (y - 6x)

D. (3y + 2x) (y - 6x)

Detailed Solution

There is an explanation video available below.
12.

Find the value of k if y - 1 is a factor of y3 + 4y2 + ky - 6

A. -6

B. -4

C. O

D. 1

Detailed Solution

There is an explanation video available below.
13.

y varies directly as w2. When y = 8, w = 2. Find y when w = 3

A. 18

B. 12

C. 9

D. 6

Detailed Solution

There is an explanation video available below.
14.

P varies directly as Q and inversely as R. When Q = 36 and R = 16, P = 27. Find the relation between P, Q and R.

A. \(P = \frac{Q}{12R}\)

B. \(P = \frac{12Q}{R}\)

C. \(P = 12QR\)

D. \(P = \frac{12}{QR}\)

Detailed Solution

There is an explanation video available below.
15.

What is the solution of \(\frac{x - 5}{x + 3} < -1\)?

A. -3 < x < 1

B. x < -3 or x > 1

C. -3 < x < 5

D. x < -3 or x > 5

Detailed Solution

There is an explanation video available below.
16.

Evaluate the inequality \(\frac{x}{2} + \frac{3}{4} \leq \frac{5x}{6} - \frac{7}{12}\)

A. \(x \geq 4\)

B. \(x \leq 3\)

C. \(x \geq -3\)

D. \(x \leq -4\)

Detailed Solution

There is an explanation video available below.
17.

The 4th term of an A.P. is 13 while the 10th term is 31. Find the 24th term.

A. 89

B. 75

C. 73

D. 69

Detailed Solution

There is an explanation video available below.
18.

What is the common ratio of the G.P. \((\sqrt{10} + \sqrt{5}) + (\sqrt{10} + 2\sqrt{5}) + ... \)?

A. \(\sqrt{2}\)

B. \(\sqrt{5}\)

C. 3

D. 5

Detailed Solution

There is an explanation video available below.
19.

A binary operation * is defined by x * y = xy. If x * 2 = 12 - x, find the possible values of x

A. 3,4

B. 3,-4

C. -3,4

D. -3,-4

Detailed Solution

There is an explanation video available below.
20.

Find y, if \(\begin{pmatrix}5 & -6 \\2 & -7\end{pmatrix}\begin{pmatrix}x \\ y \end{pmatrix} = \begin{pmatrix}7 \\-11\end{pmatrix}\)

A. 8

B. 5

C. 3

D. 2

Detailed Solution

\(\begin{pmatrix}5 & -6 \\2 & -7\end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix} = \begin{pmatrix}7 \\-11\end{pmatrix}\)

By matrices multiplication;

5x - 6y = 7 ........(1)
2x - 7y = -11 ......(2)
2 x (1): 10x - 12y = 14 .......(3)
5 x (2): 10x - 35y = -55 ......(4)

(3) - (4): 23y = 69

y = 69/23 = 3
There is an explanation video available below.
11.

Factorize 2y2 - 15xy + 18x2

A. (2y - 3x) (y + 6x)

B. (2y - 3x) (y - 6x)

C. (2y + 3x) (y - 6x)

D. (3y + 2x) (y - 6x)

Detailed Solution

There is an explanation video available below.
12.

Find the value of k if y - 1 is a factor of y3 + 4y2 + ky - 6

A. -6

B. -4

C. O

D. 1

Detailed Solution

There is an explanation video available below.
13.

y varies directly as w2. When y = 8, w = 2. Find y when w = 3

A. 18

B. 12

C. 9

D. 6

Detailed Solution

There is an explanation video available below.
14.

P varies directly as Q and inversely as R. When Q = 36 and R = 16, P = 27. Find the relation between P, Q and R.

A. \(P = \frac{Q}{12R}\)

B. \(P = \frac{12Q}{R}\)

C. \(P = 12QR\)

D. \(P = \frac{12}{QR}\)

Detailed Solution

There is an explanation video available below.
15.

What is the solution of \(\frac{x - 5}{x + 3} < -1\)?

A. -3 < x < 1

B. x < -3 or x > 1

C. -3 < x < 5

D. x < -3 or x > 5

Detailed Solution

There is an explanation video available below.
16.

Evaluate the inequality \(\frac{x}{2} + \frac{3}{4} \leq \frac{5x}{6} - \frac{7}{12}\)

A. \(x \geq 4\)

B. \(x \leq 3\)

C. \(x \geq -3\)

D. \(x \leq -4\)

Detailed Solution

There is an explanation video available below.
17.

The 4th term of an A.P. is 13 while the 10th term is 31. Find the 24th term.

A. 89

B. 75

C. 73

D. 69

Detailed Solution

There is an explanation video available below.
18.

What is the common ratio of the G.P. \((\sqrt{10} + \sqrt{5}) + (\sqrt{10} + 2\sqrt{5}) + ... \)?

A. \(\sqrt{2}\)

B. \(\sqrt{5}\)

C. 3

D. 5

Detailed Solution

There is an explanation video available below.
19.

A binary operation * is defined by x * y = xy. If x * 2 = 12 - x, find the possible values of x

A. 3,4

B. 3,-4

C. -3,4

D. -3,-4

Detailed Solution

There is an explanation video available below.
20.

Find y, if \(\begin{pmatrix}5 & -6 \\2 & -7\end{pmatrix}\begin{pmatrix}x \\ y \end{pmatrix} = \begin{pmatrix}7 \\-11\end{pmatrix}\)

A. 8

B. 5

C. 3

D. 2

Detailed Solution

\(\begin{pmatrix}5 & -6 \\2 & -7\end{pmatrix}\begin{pmatrix} x \\ y \end{pmatrix} = \begin{pmatrix}7 \\-11\end{pmatrix}\)

By matrices multiplication;

5x - 6y = 7 ........(1)
2x - 7y = -11 ......(2)
2 x (1): 10x - 12y = 14 .......(3)
5 x (2): 10x - 35y = -55 ......(4)

(3) - (4): 23y = 69

y = 69/23 = 3
There is an explanation video available below.