Question

Factorise: 25x^2- 16​

Answer 1

${25x}^{2} - 16 \\ ( {5x})^{2} - (4) {}^{2} \\ using \: {a}^{2} - {b}^{2} = (a + b)(a - b) \\ (5x + 4)(5x - 4)$

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