Question

(5x-4)^2 - 4(3x+2)^2 =?

Answer 1

H = (5x-4)²-4(3x+2)²
H = 25x²-40x+16-4(9x²+12x+4)
H = 25x²-40x+16-36x²-48x-16
H = -11x²-88x
H = -11x(x+8) <=== Rpta. :)

Answer 2

(5x-4)² - 4 (3x +2) ²
25x² -2(5)(4)x+4² -[9x² +2(3)(2)x +2²]
25x² - 40x +16  - 4[ 9x² +12x +4]
25x² -40x +16  -36x² -48x -16
-11x² -88x
-11x (x -8)