5) Determine o conjunto solução da equação: x² + 12x - 189 = 01 ponto{ - 21, 9}{ 21, -9 }{ 21 }{ - 9 }

Question

asked Jan 23, 2021 211k views

1 Answer

Gates · Answer 1 · 2021-01-30T09:38:03+0000

Answer:

x = 9 or x = -21

Explanation:

Solve for x over the real numbers:

x^2 + 12 x - 189 = 0

The left hand side factors into a product with two terms:

(x - 9) (x + 21) = 0

Split into two equations:

x - 9 = 0 or x + 21 = 0

Add 9 to both sides:

x = 9 or x + 21 = 0

Subtract 21 from both sides:

Answer: x = 9 or x = -21