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Question

Factorise : 2x33x217x+30

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Solution

We have, 2x33x217x+30

=2x34x2+x22x15x+30 [3x2=4x2+x2,17x=2x15x]

=2x2(x2)+x(x2)15(x2)

=(x2)(2x2+x15)

=(x2)(2x2+6x5x15) [x=6x5x]

=(x2)[2x(x+3)5(x+3)]

=(x2)(x+3)(2x5)


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