Question

using proper identity (2x+5y)²=​

Answer 1

Step-by-step explanation:

using identity (a+b) ²= a²+b²+2ab

$a = 2x \: \: b = 5y \\ {(2x + 5y)}^{2} = {(2x)}^{2} + {(5y)}^{2} + 2(2x)(5y) \\ = 4 {x}^{2} + 25 {y}^{2} + 10xy$

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Answer 2

Answer:

Step-by-step explanation:

use identity: (a+ b)^2= a^2 + 2(ab) b^2

(2x)^2 + 2(2x)(5y) +(5y)^2

4x^2 +20xy + 25y^2