Question

Expond the following using
suitable identity
(7x +5 y)²​

Answer 1

$\huge{\mathfrak{\underline{\blue{answer}}}}$

$49 {x}^{2} +7 0xy + 25 {y}^{2}$

$\large{\mathfrak{\underline{\blue{explanation}}}}$

$identity = > {(a + b)}^{2} = {a}^{2} + 2ab + {b}^{2}$

${(7x + 5y)}^{2}$

$= {(7x)}^{2} + 2(7x)(5y) + {(5y)}^{2}$

$= 49 {x}^{2} + 70xy + {25y}^{2}$

Answer 2

$49 {x}^{2} + 25 {y}^{2} + 70xy$

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