What about it? Factorise it?
x(x - 7)
13X squared + 7X + 12
X2 - 4= (x + 2)(x - 2)===========
3x2 - 8x = x(3x - 8)
(x - 3)(2x - 7)
5x2 + 9x + 13 has no real factors.
Factorise it: (x + 5)(3x - 8)
X squared + 7X + 12?
x2-x-30 = (x-1/2)2 - 1/4 -30 as (a+b)2=a2+2ab+b2 with a=x then b=-1/2 = (x-1/2)2 - 121/4 = [(x-1/2)-sqrt(121/4)] [ [(x-1/2)+sqrt(121/4)] as a2-b2=(a-b)(a+b) then = (x-1/2-11/2)(x-1/2+11/2) = (x-6)(x+5)
It is: x(x-3) factorized
x(x-7)