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Can the value of y = x & # 178; - 2x-3 be equal to - 5? Why? Help!
Because when x = 3 / 2, the minimum value of Y is - 15 / 4, and - 15 / 4 > - 5, so it is absolutely impossible to be equal to - 5
Can the value of y = x & # 178; - 2x-3 be equal to - 5? Why?
Is it the value of X or the value of Y
A:
y=x²-2x-3
y=(x²-2x+1)-4
y=(x-1)²-4>=0-4=-4
So: the minimum value of Y is - 4, not - 5
Given x2-y2 = 6, X-Y = 1, then x + y equals ()
A. 2B. 3C. 4D. 6
∵ x2-y2 = (x + y) (X-Y) = 6, X-Y = 1, ∵ x + y = 6
1. (2x & # 178; - 3Y) &# 178; how much is it?
2.(-1+2x)（4x²+1) (2x+1)
4x4-12x2y+9y2
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