Math

solve the equation by completing the square round to da nearest hundred if nessesary.
x^2 + 10x = 18
A -11.56, 1.56
B 11.56, 1.56
C -11.56, - 1.56 my answer
D 11.56, -1.56



solve the equation by completing the square

x^2 + 9x -14 = 0

A 10.35, 1.35 Meh answer
B 10.35, -1.35
C -10.35, -1.35
D -10.35, 1.35

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  1. follow these steps
    1. If the x^2 term has a coefficient other than 1, divide each term by that coefficient.
    (in both of your cases, we can skip that step)
    2. take half of the coefficient of the x term
    3.square that
    4. Add this to both sides of the equation.
    5. Your left side is now a perfect square, write it as such
    6. Take the √ of both sides , make sure you have ± of the constant
    7. isolate x and you are done

    the first one:
    1. x^2 + 10x = 18
    2 ..... 1/2 of 10 is 5
    3. 5^2 = 25
    4. x^2 + 10x + 25 = 18 + 25
    5. (x+5)^2 = 43
    6. x+5 = ± √43
    7. x = -5 ± √43

    In a solution I would write:
    x^2 + 10x = 18
    x^2 + 10x + 25 = 18 + 25
    (x+5)^2 = 43
    x+5 = ±√43
    x = -5 ± √43

    you do the 2nd one in the same way, show me the steps

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