Question

Factorise:

9(x + a)^ - 4x^​

Answer 1

Answer:

(5x + 3a)(x + 3a)

Step-by-step explanation:

9(x+a)^2 - 4x^2

= 9($x^{2}$+$a^{2}$+2ax) - $(2x)^2$

=($9x^{2}$+$9a^{2}$+18ax)  - $(2x)^2$

=$(3x+3a)^2$ - $(2x)^2$

=(3x+3a+2x)(3x+3a-2x)

=(5x+3a)(x+3a)