factorise (3x+2y)^2-6(3x+2y)-72
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Answer:
(3x+2y-12)(3x+2y+6)
Step-by-step explanation:
suppose (3x+2y) = a
a²-6a-72
= a²-(12-6)a-72
= a²-12a+6a-72
= a(a-12)+6(a-12)
= (a-12)(a+6)
= (3x+2y-12)(3x+2y+6)
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