Question

Resolva a equação:4x*2+(x-1)(x-10)=4x*2-4x

Answer 1

4x²+(x-1)(x-10)=4x²-4x //distributiva
4x²+x²-10x-x+10=4x²-4x // igualando a 0
4x²-4x²+x²-11x+4x+10=0
x²-7x+10=0
Bhaskara
∆=b²-4ac
∆=7²-4•10
∆49-40
∆=9

x= (-b±√∆)/2a
x=(7±√9)/2
x=(7±3)/2

x=(7+3)/2 x'=(7-3)/2
x=10/2 x'=4/2
x=5 x'=2

S={2,5}