Question

factorise it please❤️​​

Answer 1

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(x²-3x)(x²-3x-1)-20

=a(a-1)-20[let a=x²-3x]

=a²-a-20

=a²-5a+4a-20

=a(a-5)+4(a-5)

=(a+4)(a-5)

=(x²-3x+4)(x²-3x-5)[putting the value of a]