Question

Help Please??? medals given.

Answer 1

Ask

Answer 2

what's the question?

Answer 3

\[x^{2} - 3x - 28=0\]

Answer 4

??

Answer 5

What methods to solve this type of equations do you know?

factoring
Quadratic Formula
Completing the Square

Answer 6

the factoring part messes me up

Answer 7

Simplifying
x2 + 3x + -28 = 0

Reorder the terms:
-28 + 3x + x2 = 0

Solving
-28 + 3x + x2 = 0

Solving for variable 'x'.

Factor a trinomial.
(-7 + -1x)(4 + -1x) = 0

Subproblem 1
Set the factor '(-7 + -1x)' equal to zero and attempt to solve:

Simplifying
-7 + -1x = 0

Solving
-7 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '7' to each side of the equation.
-7 + 7 + -1x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -1x = 0 + 7
-1x = 0 + 7

Combine like terms: 0 + 7 = 7
-1x = 7

Divide each side by '-1'.
x = -7

Simplifying
x = -7
Subproblem 2
Set the factor '(4 + -1x)' equal to zero and attempt to solve:

Simplifying
4 + -1x = 0

Solving
4 + -1x = 0

Move all terms containing x to the left, all other terms to the right.

Add '-4' to each side of the equation.
4 + -4 + -1x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -1x = 0 + -4
-1x = 0 + -4

Combine like terms: 0 + -4 = -4
-1x = -4

Divide each side by '-1'.
x = 4

Simplifying
x = 4
Solution
x = {-7, 4}

Answer 8

@Miallions check this out also if you are stuggling with it http://www.youtube.com/watch?v=N6R-8GktQZw :)

Answer 9

thanks a bunch!!!:)

Answer 10

You are very welcome!!!!!!

Answer 11

@mmss, try to make her do it, helping her with tips and hints.
Please don't post the work for the person you're helping, OK?
Thank You!

Answer 12

@SolomonZelman okay.........