Question

x²+8x+7 qual o resultado?

Answer 1

a = 1
b = 8
c = 7

Δ = b² - 4.a.c
Δ = 8² - 4 . 1 . 7
Δ = 64 - 28
Δ = 36

x = -b +- √Δ  /  2.a
x = -8 +- √36  / 2.1
x = -8 +- 6 / 2

x1 = -8+6 / 2
x1 = -2/2
x1 = -1

x2 = -8-6 / 2
x2 = -14/2
x2 = -7

Answer 2

x² + 8x + 7 = 0
a = 1; b = 8; c = 7

Δ = b² - 4ac
Δ = 8² - 4.1.7
Δ = 64 - 28
Δ = 36

x = - b +/- √Δ       - 8 +/- √36
     --------------  = -----------------
            2a                2.1

x = - 8 + 6
      ----------- = -2/2 = - 1
          2

x = - 8 - 6
      ---------- = -14/2 = - 7
          2   

R.: x = -1 e x = - 7