Question

2.Expand 25x 2 - 4y 2 using identity i will definelately mark you as brilliant

Answer 1

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

By using identity , a²- b² = (a+b)(a-b)

$\: \: \: \: \: {(5x)}^{2} - {(2y)}^{2} \\ = (5x + 2y)(5x - 2y)$

Answer 2

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$$\begin{lgathered}\: \: \: \: 25 {x}^{2} - 4 {y}^{2} \\ = {(5x)}^{2} - {(2y)}^{2}\end{lgathered}$$

By using identity , a²- b² = (a+b)(a-b)

$$\begin{lgathered}\: \: \: \: \: {(5x)}^{2} - {(2y)}^{2} \\ = (5x + 2y)(5x - 2y)\end{lgathered}$$