Question

x2-(x-4)2=128 ayudaaa !

Answer 1

x²-(x-4)²=128
x²-(x²-8x+16)=128                   (x-4)×(x-4)=x²-8x+16
x²-x²+8x-16=128
0+8x=128+16
8x=144
x=144/8
x=18