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" Q5.FACTORISE "(x^(2)-4x-21)=?...

" Q5.FACTORISE "(x^(2)-4x-21)=?

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If P(x)=(x+2)(x^(2)-4x-21),Q(x)=(x-7)(2x^(2)+x-6) and their HCF is x^(2)-5x-14 then LCM of P(x)&Q(x) is

Factorise: x ^(2) - 4x -12

Factorise : 4x^(2)-x-5

Factorise :(x+5)^(2)-4(x+5)

Factorise x^(2)+4x+4

Factorise : (iv) 5x^(2) - 4xy - 12y^(2)

Find the roots of the following quadratic equations by the factorisation method. 21x^(2)-2x+1/21=0

Find the roots of the following quadratic equations by the factorisation method. 21x^(2)-2x+1/21=0