Question

1 - A expressão (10 + b²).(10 - b²), é igual a: *

5 pontos

(A) b⁴ – 100
(B) 100 – b²
(C) 100 – b⁴
(D) b⁴ – 100

Answer 1

Resposta:

Letra: C 100-b⁴

Explicação passo-a-passo:

10(10-b²)+b²(10-b²)

10⋅10+10(-b²)+b²(10-b²)

10⋅10+10(-b²)+b²⋅10+b²(-b²)

100+10(-b²)+b²⋅10+b²(-b²)

100-10b²+b²⋅10+b²(-b²)

100-10b²+10⋅b²+b²(-b²)

100-10b²+10b²-b²b²

100-10b²+10b²-(b²b²)

100-10b²+10b²-b²+²

100-10b²+10b²-b⁴

100+0-b⁴

100-b⁴

Answer 2

Oie, Td Bom?!

■ Resposta: Opção C.

$= (10 + b {}^{2} ) \: . \: (10 - b {}^{2} )$

$= 10 {}^{2} - (b {}^{2} ) {}^{2}$

$= 100 - b {}^{4}$

Att. Makaveli1996