Question

Find the product using a suitable identity.

(m + 3)(m -3)(m2

+ 9)​

Answer 1

Answer:

correct answer is m^4-81

Step-by-step explanation:

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Answer 2

$\huge \underline{ \underline{ \bf \purple{Solution :}}}$

$\longrightarrow \sf(m + 3)(m - 3)( {m}^{2} + 9) \\ \\\longrightarrow \sf ( {m}^{2} - {3}^{2})( {m}^{2} + 9) \\ \\\longrightarrow \sf ( {m}^{2} - 9)( {m}^{2} + 9) \\ \\ \longrightarrow \sf {( {m}^{2}) }^{2} - {9}^{2} \\ \\ \longrightarrow \boxed{\sf {m}^{4} - 81}$

Identity Used :-

$\implies\bf(a + b)(a - b) = {a}^{2} - {b}^{2}$