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When x-y equals 7 and xy equals 8 find the value of x square plus y square?
Updated: 12/18/2022
Wiki User
∙ 14y agoBest Answer
x2 + y2 = x2 - 2xy + y2 + 2xy = (x - y)2 + 2xy = 72 + 2*8 = 49 + 16 = 65
You could, instead, solve the two equations for x and y and substitute, but the above method is simpler.
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∙ 14y agoThis answer is:
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