Question

Qual o resultado? ( 9xy³ + 7y4 ) . ( 9xy³ + 7y4)

Answer 1

(9xy³+7y⁴)*(9xy³+7y⁴) = (9xy³+7y⁴)²

Por praticidade, chamaremos 9xy³ de a e 7y⁴ de b. Assim:

(a+b)² = a²+2ab+b²

Logo:

(9xy³)² + 2(9xy³)(7y⁴) + (7y⁴)²

81x²y⁶ + 126xy⁷ + 49y⁸

Answer 2

Oie, Td Bom?!

$= (9xy {}^{3} + 7y {}^{4} ) \: . \: (9xy {}^{3} + 7y {}^{4} )$

$= (9xy {}^{3} + 7y {}^{4} ) {}^{2}$

$= (9xy {}^{3} ) {}^{2} + 2 \: . \: 9xy {}^{3} \: . \: 7y {}^{4} + (7y {}^{4} ) {}^{2}$

$= 81x {}^{2} y {}^{6} + 126xy {}^{7} + 49y {}^{8}$

Att. Makaveli1996