Question

Aplique a formula de Bhaskara e encontre as raizes das equaçoes x²-8x+7=0

Answer 1

x = -b +/- raiz de b² - 4ac / 2a
x = -(-8) +/- raiz -8² - 4.1.7/2.1
x = 8 +/- raiz 64 - 28/ 2
x = 8 +/- raiz 36/2
x = 8 +/- 6 tudo dividido por 2
x ¹ = 8+6/2 = 7
x ¹¹ = 8-6/ 2 = 1

Answer 2

x²-8x+7=0

Δ = (-8)² - 4×1×7
Δ = 64 - 28
Δ = 36

x₁ = $\frac{-(-8) + \sqrt{36} }{2*1} = \frac{8+6}{2} = \frac{14}{2} = 7$


x₂ = $\frac{-(-8) - \sqrt{36} }{2*1} = \frac{8-6}{2} = \frac{2}{2} = 1$