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RS Aggarwal Solutions Class 8 Mathematics Solutions for Factorisation Exercise 7E in Chapter 7 - Factorisation
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Question 10 Factorisation Exercise 7E
\left(12m^2-27\right)=?
a. (2m-3)(3m-9)
b. 3(2m-9)(3m-1)
c. 3(2m-3)(2m+3)
d. None of these
Answer:
By taking 3 as the common factor we get,
By using the formula a^2-b^2=(a-b)(a+b)
\begin{aligned} \left(12 m^{2}-27\right) &=3\left(4 m^{2}-9\right) \\ &=3(2 m-3)(2 m+3) \end{aligned}
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