SOLUTION: Solve x^2 + x - 42=0 x= Is the answer 6?

Question 551778: Solve x^2 + x - 42=0
x= Is the answer 6?
Found 3 solutions by nyc_function, MathTherapy, jim_thompson5910:
Answer by nyc_function(2741)   (Show Source): You can put this solution on YOUR website!
If the answer is 6, then when we replace x with 6, the answer should be 0, right?

x^2 + x - 42 = 0...This is your quadratic equation.

Let x = 6

(6)^2 + 6 - 42 = 0

36 + 6 - 42 = 0

42 - 42 = 0

0 = 0...IT CHECKS!!!

Yes, the answer is x = 6.

Answer by MathTherapy(10552)   (Show Source): You can put this solution on YOUR website!

Solve x^2 + x - 42=0
x= Is the answer 6?

It depends!!

Solve the quadratic and you should get x = - 7, or 6

This is your answer unless there is some type of stipulation that x should be positive (> 0), thereby making the only solution, 6

Send comments and �thank-yous� to �D� at MathMadEzy@aol.com
Answer by jim_thompson5910(35256)   (Show Source): You can put this solution on YOUR website!

Start with the given equation.

Notice that the quadratic is in the form of where , , and

Let's use the quadratic formula to solve for "x":

Start with the quadratic formula

Plug in , , and

Square to get .

Multiply to get

Rewrite as

Add to to get

Multiply and to get .

Take the square root of to get .

or Break up the expression.

or Combine like terms.

or Simplify.

So the solutions are or

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