factorize
xsquare-21x+90
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Answer:
x^2-21x+90
here we choose two no which sums gives you 21 and their product gives you 90
i. e 15 & 6
then,
x^2 -15x-6x + 90
taking x common form first two term and taking (-6) common form last two term
x(x-15) -6 (x-15)
taking (x-15) common
(x-15) (x-6)
these are the required factor
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