Factorise :- $64 x^{2} - 81 y^{2}$

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Solution

$(8 x)^{2} - (9 y)^{2} = (8 x + 9 y) (8 x - 9 y)$
${a^{2} - b^{2} = (a + b) (a - b)}$ .

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Factorise: $36 x^{2} - 81 y^{2}$

Find $64 x^{2} + 81 y^{2} + \frac{144 x y}{48}$ when $x = 11$ and $y = \frac{4}{3}$

64 x^{3} - 729 y^{3}

y = \frac{4}{3} .

Find the value of the expression

$(64 x^{2} + 81 y^{2} + 144 x y)$ when $x = 11$ and $y = \frac{4}{3}$

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