Question

se xy= 8, qual o valor de?

A) 32
B) 24
C) - 24
D) - 32
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rápido pfv

Answer 1

(x-y)² - (x+y)² = x²-2xy+y² -(x²+2xy+y²)

(x-y)² - (x+y)² = x²-2xy+y² -x²-2xy-y²

(x-y)² - (x+y)² = -4xy = -4.(8) = -32 D) ✓