x2 + y2 if x + y = 7 and xy = 10 need asap
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Answered by
1
square both sides
x^2+2xy+y^2=49
if xy=10 then 2xy=20
substitute
x^2+20+y^2=49
x^2+y^2=49-20
x^2+y^2=29
x^2+2xy+y^2=49
if xy=10 then 2xy=20
substitute
x^2+20+y^2=49
x^2+y^2=49-20
x^2+y^2=29
Answered by
0
Answer:
29
Step-by-step explanation:
(x+y)²=x²+y²+2xy
(7)²=x²+y²+2(10)
49= x²+y²+20
x²+y²=49-20
x²+y²=29
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