Sainik School Entrance Exam 2019 Solved Paper

Question : 6 of 150

Marks: +1, -0

Which of the following is equal to

x^3-225x

Solution:

(b)

x^3-225 x

=x(x^2-225)

=x\ft(x^2-(15)^2) [∵ a^2-b^2=(a-b)(a+b)]

=x(x-15)(x+15)

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