Question

Q. Simplify: (5x + 4y)(5x - 4y)​

Answer 1

By identity.......(a+b)(a-b) = a^2 - b^2

$(5x + 4y)(5x - 4y) \\ \\ = ( {5x)}^{2} - ( {4y)}^{2} \\ \\ = 25 {x}^{2} - 16 {y}^{2}$

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Answer 2

Answer:

Step-by-step explanation:

(a+b) (a–b) – a ka whole square – b ka whole square

5x^2- 4y^2

25x^2-16y^2