9(x-3)(x+4)=(2x-1)(2x+1)+5(x-2)^2

问题描述:

9(x-3)(x+4)=(2x-1)(2x+1)+5(x-2)^2
我算的都要吐血了...

9(x-3)(x+4)=(2x-1)(2x+1)+5(x-2)^2
9(x-3)(x+4)=4x^2-1+5x^2-20x+20
9x^2+9x-12*9=9x^2-20x+19
9x-108=-20x+19
29x=127
x=127/29