Waec Further Mathematics 2020 Past Questions and Answers

Question 31:

• WAEC 2020

Find the inverse of \(\begin{pmatrix} 3 & 5 \\ 1 & 2 \end{pmatrix}\)

A. \(\begin{pmatrix} 5 & 1 \\ -3 & 2 \end{pmatrix}\)
B. \(\begin{pmatrix} 2 & -5 \\ -1 & 3 \end{pmatrix}\)
C. \(\begin{pmatrix} -5 & 2 \\ -1 & 3 \end{pmatrix}\)
D. \(\begin{pmatrix} 5 & 1 \\ 2 & 3 \end{pmatrix}\)

Question 32:

• WAEC 2020

If cos x = -0.7133, find the values of x between 0\(^o\) and 360\(^o\)

A. 44.5\(^o\) , 224.5\(^o\)
B. 123.5\(^o\) , 190.5\(^o\)
C. 135.5\(^o\) , 213.5\(^o\)
D. 135.5\(^o\) , 224.5\(^o\)

Question 33:

• WAEC 2020

If \(\int^3_0(px^2 + 16)dx\) = 129. Find the value of p.

A. 9
B. 8
C. 7
D. 6

Question 34:

• WAEC 2020

If \(\begin{pmatrix} p+q & 1\\ 0 & p-q \end {pmatrix}\) = \(\begin{pmatrix} 2 & 1 \\ 0 & 8 \end{pmatrix}\)
Find the values of p and q

A. P = 5, q = 3
B. P = 5, q = -3
C. P = -5, q = -3
D. P = -5, q = 3

Question 35:

• WAEC 2020

Given that X : R \(\to\) R is defined by x = \(\frac{y + 1}{5 - y}\) , y \(\in\) R, find the domain of x.

A. {y : y \(\in\) R, y \(\neq\) 0}
B. {y : y \(\in\) R, y \(\neq\) 1}
C. {y : y \(\in\) R, y \(\neq\) 5}
D. {y : y \(\in\) R, y \(\neq\) 7}