Question

85.Calcule.
a) (a - 7)(a - 9)
b) (6 - 5x)(1 - 2x)
c)(-x + 5)(x + 2)
d) (x² + x - 1)(x - 1)
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Answer 1

Resposta:

a)a²-16a+63

b)10x²-17x+6

c)-x²+3x+10

d)x³+1

Explicação passo-a-passo:

a) (a-7)(a-9)

a²+(-7-9)a+63

a²-16a+63

b)(6-5x)(1-2x)

6-12x-5x+10x²

10x²-17x+6

c)(-x+5)(x+2)

-x²-2x+5x+10

-x²+3x+10

d)(x²+x-1)(x-1)

x³-x²+x²-x+x+1

x³+1