Question

Resolva a equação:
(x-4²)=x²-40

Answer 1

(x-4²)=x²-40

x+16=x²-40

x-x²+40+16=0

-x²+x+56=0

a= -1 b=1 c=56

x=-b±√b²-4*a*c/2*a x'=-1+15/-2 x'=14/-2(-1) x'=-14/2 x'= -7

x=-1±√1²-4*(-1)*56/2(-1)

x=-1±√1+224/-2 x"=-1-15/-2 x"=-16/-2(-1) x"=16/2 x"=8

x=-1±√225/-2

x=-1±15/-2