Question

factorise of x square - 10 X + 21

Answer 1

Hey friend here is your answer

x2 - 10 x + 21

x2 - 7x - 3x + 21

x (x - 7) - 3 ( x - 7)

(x - 3) or ( x - 7)

x = 3 or x = 7

Hope it helps you.

Answer 2

your ans

x2-10x+21

taking out factors of last number it comes -3 and -7

so

(x2-3x)-(7x+21)

x(x-3)-7(x-3)

(x-7)(x-3)