Question

factories x^2 +4^x-21​

Answer 1

the answer is (x-3)(x+7)

step by step solution in attachment

Answer 2

$= {x}^{2} + 4x - 21$

$= {x}^{2} + (7 - 3)x - 21$

$= {x}^{2} + 7x - 3x - 21$

$x(x + 7) - 3(x + 7)$

$= (x + 7)(x - 3)$