Bentuk sederhana (2x-1)² - (x-3)²

x² - y² = (x - y)(x + y)
(2x-1)² - (x-3)²= (2x-1-x+3)(2x-1+x-3)
= (x+2)(3x-4)
= 3x² + 2x - 4

(2x-1)²-(x-3)²
(4x²-4x+1)-(x²-6x+9)
4x²-x²-4x+6x+1-9
3x²+2x-8=0
(x+6) (x-4)=0
x=-6/x=4