if xy=72 and x+y=17 find x^2+y^2
Answers
Answered by
1
Step-by-step explanation:
x²+y² = (x + y )² - 2xy
= 17²-2×72
= 289 - 144
= 145
Answered by
0
(x+y)^2 = x^2 + y^2 + 2xy
(17)^2 = x^2 + y^2 + 2(72)
289-144 = x^2 + y^2
145 = x^2 + y^2
(17)^2 = x^2 + y^2 + 2(72)
289-144 = x^2 + y^2
145 = x^2 + y^2
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