Question

(x^2 -9)-4(x^2-9)+3=0

Answer 1

$x^{2} -9 - 4 x^{2} + 36 + 3 = 0$
$-5 x^{2} + 0 = 0$
$x = -6$

Answer 2

$-5 x^{2} + 30 = 0$

Answer 3

Вторая строчка ... + 30 = 0