Question

Use the identity (x + a)(x + b) to find the product of
(x + 3)(x + 7).
$\left[2Marks\right]$

Answer 1

(x + a)(x + b)=x² + (a + b)x + ab

(x + 3)(x + 7)
a=3, b= 7
$\left[1Mark\right]$

(x + 3)(x + 7) = x² + (3 + 7)x + (3)(7)

(x + 3)(x + 7) = x² + 10x + 21
$\left[1Mark\right]$