Question

x2-2x=x+4 pfv alguem sabe responder essa?

Answer 1

Resposta:

x2 -3x -4=0

(x -4)(x + 1)=0

x= 4, -1

Answer 2

• x² - 2x = x + 4
• x² -2x -x -4 = 0
• x² -3x -4 = 0
• a = 1 ; b = -3 ; c = -4
• Delta = b² -4*a*c
• Delta = (-3)² -4*1*(-4)
• Delta = 9 + 16
• Delta = 25

• x = -b +-√Delta / 2a

• x' = +3 + √25 / 2 => x' = 3 + 5 / 2 = 8/2 = 4
• x" = +3 - √25 /2 => x" = 3 - 5 / 2 = -2/2 = -1

Resposta:

• x' = 4
• x" = -1