Question

4a square+25b square if ab =7 and 2a+5b=10​

Answer 1

Answer:

I hope this answer may be correct

Answer 2

Answer:

$2a + 5b = 10 = > {(2a + 5b)}^{2} = {10}^{2}$

$= > 4 {a}^{2} + 25 {b}^{2} + 20ab = 100$

$= > 4 {a}^{2} + 25 {b}^{2} + 20(7) = 100$

$= > 4 {a}^{2} + 25 {b}^{2} = 100 - 140 = - 40$

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