1. If 5x - 2y = 7 and xy = 2, find the value of (5x + 2y)^2
Answers
Answered by
4
Answer:
5x=5X2
x is 2
2y=2X1.5
y=1.5
then answer is
(5x+2y)^2
[(5X2)+(2X1. 5)]^2
[10+3]^2
13^2
169 is an answer
Answered by
8
Answer:
-
(5x+2y)^2-(5x-2y)^2= 40xy
(5x +2y)^2 = (5x-2y)^2+40xy
= 7^2+40x2=49+80=129
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