Question

(5a-3b)2 using proper identity​

Answer 1

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⇒(5a - 3b)²

⇒(5a)² + (3b)² - 2 × 5a × 3b

⇒25a² + 9b² - 30ab

Answer 2

Using this identity

${(x - y)}^{2} = {x}^{2} - 2xy + {y}^{2}$

Here,

$x = 5a,y = 3b$

${(5a - 3b)}^{2} = {(5a)}^{2} - 2(5a)(3b) + {(3b)}^{2} \\ = {25a}^{2} - 30ab + {9b}^{2}$

Hope this will be helpful.