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GabrielFernandes120
@GabrielFernandes120
December 2019
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Determine o valor númerico de cada expressão algebrica.
a)X²-2XY+Y² para x=2
y=-1
b)X²-2y² para X=-2
Y=-1
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lucaswhyndson
A) x²-2xy+y² = (x-y)²,
Como x=2 e y=-1,
(x-y)² = [2 -(-1)]² = (2+1)² = 3² = 9
b) Para x = -2 e y = -1,
x²-2y² = (-2)²-[2*(-1)²] = 2²-(2*1) = 4-2 = 2
2 votes
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Como x=2 e y=-1,
(x-y)² = [2 -(-1)]² = (2+1)² = 3² = 9
b) Para x = -2 e y = -1,
x²-2y² = (-2)²-[2*(-1)²] = 2²-(2*1) = 4-2 = 2