Question

solve the following using idetity ( 7x - 4y) ² full answer please​

Answer 1

Step-by-step explanation:

Identity:

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

Therefore,

${(7x - 4y)}^{2} = {(7x)}^{2} - 2 \times 7x \times 4y + {(4y)}^{2}$

$= 49 {x}^{2} - 56xy + 16 {y}^{2}$

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