factorise (a^2+3a)^2-5(a^2+3a)-b(a^2+3a)+5b
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Step-by-step explanation:
(a^2+3a)^2-5(a^2+3a)-b(a^2+3a)+5b
(4a^+6a^)^-10a^-15a-2a^b-3ab +5b
16a^+36a^-10a^-15a-2a^b-3ab+5b
52a^-10a^-15a-2a^b-3ab+5b
42a^-15a+5b-a
42a^-16a+5b
2(21a-8)+5b
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