Further Mathematics questions and answers

Further Mathematics Questions and Answers

Test your knowledge of advanced level mathematics with this aptitude test. This test comprises Further Maths questions and answers from past JAMB and WAEC examinations.

91.

Find the equation of the normal to the curve y= 2x\(^2\) - 5x + 10 at P(1, 7)

A.

y+x-3 =0

B.

y-x+6=0

C.

y - x - 6=0

D.

y -x+ 3 =0

Correct answer is C

From y= 2x- 5x 10 ; dy/dx= 4x-5

But at (1, 7); m\(_1\) = (dy/dx)\(_{1,7}\)

= 4(1) - 5 = -1

Using m\(_1\)m\(_2\),= -1; m\(_2\) = 1.

Gradient m\(_2\), of normal at (1,7) is 1.

Using y - y\(_1\) = m(x - x\(_1\))

y - 7 = 1(x - 1) ;

y - 7 = x - 1

y - x - 6 = 0

92.

The gradient ofy= 3x\(^2\) + 11x + 7 at P(x.y) is -1. Find the coordinates of P. 

A.

(-3, -2)

B.

(-2,-3)

C.

(-2,3)

D.

(2,2)

Correct answer is B

y= 3x\(^2\) + 11x +7;

dy/dx = 6x + 11= -1;

6x = -12;

x=-2

y=  3x\(^2\) + 11x + 7

At x-2,

y= 3(-2)\(^2\) +11(-2) + 7

= 12 - 22 + 7= -3

p(x, y) = (-2,-3)

93.

A bag contains 8 red, 4 blue and 2 green identical balls. Two balls are drawn randomly from the bag without replacement. Find the probability that the balls drawn are red and blue.

A. 12/91 B. C. D.

A.

12/91

B.

16/91

C.

30/91

D.

32/91

Correct answer is D

Total balls = 8+4+2= 14

n(R) = 8, n (B) =4, n(G) = 2

Without replacement, it is p(RB) or p(BR)

= (8/14 x 4/13) + (4/14 + 8/13) = 16/91 + 16/91

= 32/91

95.

If 2i +pj and 4i -2j are perpendicular, find the value of p.

A.

2

B.

3

C.

4

D.

5

Correct answer is C

(2i + pi) (4i - 2j) =0

2 x 4 - p x 2=0 ;

8-2p = 0;   2p-8;

p=4