Question

By using identities, find ( 5 x - 4 y) + ( 5x + 4 y )​

Answer 1

Step-by-step explanation:

$(5x - 4y) \times (5x + 4y)$

Using identity:

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

${(5x)}^{2} - {(4y)}^{2}$

$= 25 {x}^{2} - 16 {y}^{2}$

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