Explications étape par étape:
(3x-5)(4x+5)+(2x+3)(3x-2)
12x^2+15x-20x-25+6x^2-4x+9x-6
18x^2-31
(6x+5)(6x-5)-((2x-3)(4x+7)
36x^2-25-(8x^2+2x-21)
36x^2-25-8x^2-3x+22
28x^2-2x-4
(3x+1)(4-2x)-(2x-3)(6x-1)
12x-6x^2+4-2x-(12x^2-20x+3)
-6x^2-10x+4-12x^2+20x-3
-18x^2+10x+1
