- If x-y=13 and xy=28,then find x^2+y^2.
Answers
Answered by
6
Answer:
225
Step-by-step explanation:
x-y= 13
xy= 28
(x-y) ²= (13)²
x²-y²= 169
x²-2xy+y²
x²-2xy+y²=169
x²+y²-2*28=169
x²+y²-56=169
x²+y²=169+56
x²+y²= 225
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