Ask Question
26 November, 21:19

Rewrite the function by completing the square r^2+18x+80=0

+4
Answers (1)
  1. 26 November, 22:05
    0
    x = - 10, - 8

    Step-by-step explanation:

    x^2+18x+80=0

    Subtract 80 from each side

    x^2+18x=-80

    Take the coefficient of x

    18

    Divide by 2

    18/2 = 9

    Square it

    9^2 = 81

    Add 81 to each side

    x^2+18x + 81=-80+81

    (x + 9) ^2 = 1

    Take the square root of each side

    sqrt ((x + 9) ^2) = ±sqrt (1)

    x+9 = ±1

    Subtract 9 from each side

    x+9-9 = - 9 ±1

    x = - 9+1 x = - 9-1

    x = - 8 x = - 10
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “Rewrite the function by completing the square r^2+18x+80=0 ...” in 📘 Mathematics if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers