Question

La 16 por favor con explicacion.

Answer 1

(x+4)²=2x(5x-1)-7(x-2)
x²+8x+16=10x²-2x-7x+14
x²+8x+16=10x²-9x+14
x²+8x+16-10x²+9x-14=0
-9x²+17x+2=0
-(x-2)(9x+1)=0 multiplicamos por -1
(x-2)(9x+1)
(x-2)=0 ......x-2=0..................x=2  
(9x+1)=0...9x+1=0....9x=-1....x=-1/9