Question

(4x-3)²-9(x+5)(x-2)=7(x+2)²-8

Answer 1

16x²-24x+9-9(x²-2x+5x-10)=7(x²+4x+4)-8
16x²-24x+9-9x²+18x-45x+90=7x²+28x+28-8
7x²-3x+99=7x²+28x+20
7x² se simplifica
-3x+99=28x+20
79=31x
x=79/31

Answer 2

(4x-3)²-9(x+5)(x-2)=7(x+2)²-8
(16x²+9-24x)-9[x(x-2)+5(x-2)]=7(x²+4+4x)-8
16x²+9-24x-9(x²-2x+5x-10)=7x²+28+28x-8
16x²+9-24x-9(x²+3x-10)=7x²+20+28x
16x²+9-24x-9x²-27x+90=7x²+20+28x
7x²+99-51x=7x²+20+28x
99-51x=20+28x
99=20+79x
79x=79
x=1