factorise 16a² - 9(b-3a)²
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Step-by-step explanation:
16a^2-9(b-3a)^2
16a^2-9((b) ^2-2(b)(3a) +(3)^2)
16a^2-9(b^2-6ab+9a^2)
16a^2-9b^2+54ab-81a^2
-65a^2-9b^2+54ab
65a^2+9b^2-54ab