Question

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

Answer 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

Answer 2

Reiny none of that is even close to any of the options for an answer

Answer 3

It is choice A.
-11.56,1.56