solve this problem with explanation
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Answer:
(a) (a+2b)(9b-2a)
Step-by-step explanation:
(a+2b)²-(a+2b)(3a-7b)
= (a²+b²+4ab) - (3a²+6ab-7ab-14b²)
= a²+b²+4ab-3a²-6ab+7ab+14b²
= a²-3a²+4ab-6ab+7ab+14b²+b²
= -2a²+5ab+18b²
= 18b²+5ab-2a²
= 18b²+9ab+4ab-2a²
= 9b(2b+a)-2a(2b+a)
= (2b+a)(9b-2a)
= (a+2b)(9b-2a)
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