Question

(x+7)²=1
me ajudem por favor por modo do delta

Answer 1

(x + 7)² = 1
x² + 14x + 49 = 1
x² + 14x + 48 = 0

Δ = 4

x' = - 6

x" = - 8

Answer 2

(x+7)² = 1
(x+7) . (x+7) = 1
x² + 7.x + 7.x + 49 =1
x² + 14.x + 49 - 1 =0
x² + 14.x + 48 =0

a = 1; b = 14; c = 48

Δ = b² - 4 . a . c
Δ = 14² - 4 . 1 . 48
Δ = 196 - 192
Δ = 4

x₁ = - b + √Δ / 2 . a
x₁ = - 14 + √4 / 2 . 1
x₁ = -14 + 2 /2
x₁ = -12/2
x₁ = - 6

x₂ = -b - √Δ / 2 . a
x₂ = -14 - √4/ 2 .1
x₂ = -14 - 2 / 2
x₂ = -16/2
x₂ = - 8