Question

a²+4a-21, Factorize the given equation.

Answer 1

a^2+4a-21
=a^2+7a-3a-21
=a(a+7)-3(a+7)
=(a+7)(a-3)

Answer 2

HEYA!!
----------

⚫Given Expression is :-
=====================

$a {}^{2} + 4a - 21 = 0 \\ \\ a {}^{2} + 7a - 3a - 21 = 0 \\ \\ a(a + 7) - 3(a + 7) \\ \\ (a - 3)(a + 7) \\ \\ a = 3 \: \: or \: a = - 7$
-----------------------------------------------------------------------------------------------------