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.

106.

If 2y\(^2\) + 7 = 3y - xy, find \(\frac{dy}{dx}\)

A.

\(\frac{-y}{4x+y-3}\)

B.

\(\frac{y}{4x+y-3}\)

C.

\(\frac{-y}{4x+x-3}\)

D.

\(\frac{y}{4x+x-3}\)

Correct answer is D

2y\(^2\) + 7 = 3y - xy, find \(\frac{dy}{dx}\)

4y  \(\frac{dy}{dx}\) + 0 = 3 \(\frac{dy}{dx}\) - x  \(\frac{dy}{dx}\) + y

{4x+x-3}  \(\frac{dy}{dx}\) = y

= \(\frac{y}{4x+x-3}\)

107.

A fair die is tossed 60 times and the results are recorded in the table

Number of die 1 2 3 4 5 6
Frequency 15 10 14 2 8 11

Find the probability of obtaining a prime number.

A.

\(\frac{7}{30}\)

B.

\(\frac{1}{6}\)

C.

\(\frac{7}{15}\)

D.

\(\frac{8}{15}\)

Correct answer is D

Prime number in the experiment are 2,3 and 5 with frequencies 10,14 and 8

P(obtaining a prime number) = \(\frac{10+14+8}{60}\)

= \(\frac{32}{60}\) or \(\frac{8}{15}\)

108.

A body of mass 15kg is placed on a smooth plane which is inclined at 60° to the horizontal. If the box is at rest,

calculate the normal reaction to the plane. [ Take g = 10m/s\(^2\) ]

A.

129.9N

B.

75N

C.

60.0N

D.

7.5N

Correct answer is B

Let  the normal reaction be R

R = Wcosø = mgcosø

= 15 * 10cos 60°

= 150 * 0.5000

= 75N

109.
110.

Find the inverse of  \(\begin{pmatrix} 4 & 2 \\ -3 & -2 \end{pmatrix}\)

A.

\(\begin{pmatrix} 1 & 1 \\ -1.5 & -2 \end{pmatrix}\)

B.

\(\begin{pmatrix} 1 & -1 \\ 1.5 & -2 \end{pmatrix}\)

C.

\(\begin{pmatrix} -2 & 1 \\ 1.5 & 1 \end{pmatrix}\)

D.

\(\begin{pmatrix} -2 & -1 \\ 1.5 & 1 \end{pmatrix}\)

Correct answer is A

Let A =  \(\begin{pmatrix} 4 & 2 \\ -3 & -2 \end{pmatrix}\);

|A| = -8 - (-6) = -8 + 6

|A| = -2

A\(^{-1}\) = \(\frac{1}{-2}\) =  \(\begin{pmatrix} -2 & 2- \\ 3 & 4 \end{pmatrix}\)

= \(\begin{pmatrix} 1 & 1 \\ -1.5 & -2 \end{pmatrix}\)