Respuesta:
(4-7a)² +(4a-7) (4a-7)+(a-9) (a+2)
16-56a+49a²+(4a-7)²+a²+2a-9a-18
16-56a+49a²+16a²+56a+49+a²+2a-9a-18
47-119a+66a²
66a²-119a+47
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Verified answer
Respuesta:
(4-7a)² +(4a-7) (4a-7)+(a-9) (a+2)
16-56a+49a²+(4a-7)²+a²+2a-9a-18
16-56a+49a²+16a²+56a+49+a²+2a-9a-18
47-119a+66a²
66a²-119a+47