Question

Find the value of a if the expression $3x^2+ax-7$ is divisible by (x - 1)

• A. -4
• B. 4
• C. 10
• D. -10

Answer 1

Answer: (B)

4

As $3x^2+ax-7$ is divisible by $(x-1)$; $x=1$ will satisfy the equation $3x^2+ax-7=0$
Substituting $x=1$, we get $\Rightarrow 3\times 1^2+a\left(1\right)-7=0$
$=>a=4$