Question 58 Answer and Explanation _ACT April 2019 Form Z15 Math Section

Question 58 Answer and Explanation _ACT April 2019 Form Z15 Math Section

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58. For what value of b will the determinant of the matrix $\begin{aligned}\begin{bmatrix} 4 & b \\ 2 & 3 \end{bmatrix}\end{aligned}$ have a value of 18?

F. $-\frac{10}{3}$

G. -3

H. 3

J. 6

K. 15

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

From the matrix formula, 12-2b=18, so b=-3.