if x=2,y=9 and xy=7,find the value of x2+4y2
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Answered by
1
Just put the values you are given
2^2 +4*9^2=328
2^2 +4*9^2=328
Answered by
1
x = 2
y = 9
xy = 7
x² + 4y² = (x)² + (2y)² = (x +2y)²-2.x.2y
= (2 + 2.9)² - 4.7
= (20)² - 28
= 400-28 = 372
Answer:-. 372
y = 9
xy = 7
x² + 4y² = (x)² + (2y)² = (x +2y)²-2.x.2y
= (2 + 2.9)² - 4.7
= (20)² - 28
= 400-28 = 372
Answer:-. 372
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