Question

Resolva as equações do 2° Grau.

A)5-(x+3)(x-1)=2x+8
B)(x-2)²=2x-1

Answer 1

A) 5−(+3)⋅(−1)=2+8

5−(2−+3−3)=2+8

5−(2+2−3)=2+8

5−2−2+3=2+8

8−2−2=2+8

−2−2=2

−2−2−2=0

−2−4=0

Continua na foto abaixo:

Letra B

(−2)2=2−1

(x−2)2=2x−1

2−4+4=2−1

2−4+4−2+1=0

2−6+5=0

2−−5+5=0

⋅(−1)−5(−1)=0

(−1)⋅(−5)=0

−1=0

−5=0

1=1

2=5