Question

2 Select the correct answer. What is the product of (x-3) and (x + 7)? OA. x2 + 10X-21 O B. x2 + 4x-21 Oc. &- 4X-21 OD. x - 10x-21 Reset Next

Answer 1

`(x-3)(x+7)`

multiply each term by each term and sum the results

`\begin{gathered} (x* x)+(x*7)+(-3* x)+(-3*7) \\ x^2+7x-3x-21 \\ x^2+4x-21 \end{gathered}`

so, the right option is B

the right option is A because

`h^2+h-2`

if we factor this expression by any way we obtain

`(h+2)(h-1)`