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(a+b)(a-b) Expansion and Visualisation

Question 92 x...

Question

Question 92 (xii)

Factorise the following using the identity $a^{2} - b^{2} = (a + b) (a - b) .$

$\frac{x^{2}}{25} - 625$

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Solution

$\frac{x^{2}}{25} - 625 = {(\frac{x}{5})}^{2} - (25)^{2} = (\frac{x}{5} - 25) (\frac{x}{5} + 25)$

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(a+b)(a-b) Expansion and Visualisation

Standard VII Mathematics

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