За (За + 2с) — 4b (b+c).[factorisation]
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Step-by-step explanation:
- 3a(3a+2c)-4b(b+c)
- 9a²+6ac-4b²-4bc
- 9a²-4b²+6ac-4bc
- (3a+2b)(3a-2b)+2c(3a-2b)
- (3a-2b)(3a+2b+2c)
- (3a-2b)(3a+2(b+c))
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