Solve the equation.
x^2+18x+81=25

Question

Solve the equation.
x^2+18x+81=25

anonymous · Answer

Where do you have problems there?

anonymous · Answer

that is the problem

anonymous · Answer

x=-4

anonymous · Answer

So is the first quadratic equation that you meet?

anonymous · Answer

@Grazes i need help @Marrioncito i dont get what you saying

anonymous · Answer

Is this the first time you have to solve a quadratic equation?

anonymous · Answer

@Marrioncito yes i have solved them before.. but im asking.. how do you solve it?

anonymous · Answer

Yo have to use the "quadratic formula". In order to apply it, you have to write the polinomia. Like any other quadratic ecuation.

anonymous · Answer

$$x^2+18x+81 - 25 = 0 = x^2+18x+56$$

Then, a = 1, b = 18, and c = 56...and apply the quadratic formula.

anonymous · Answer

Have you ever used the quadratic formula?

anonymous · Answer

(x+9)^2=25

anonymous · Answer

sqrt(25=5
5=x+9
x=-4

anonymous · Answer

@Marrioncito no i have not.. @Grazes lol.. please leave him alone and I do not know which one of you all suggestions I should take

anonymous · Answer

Have you learned Squaring the Root yet? Or just factoring?

anonymous · Answer

both

anonymous · Answer

So you just square the root and factor the one side because it is already a perfect square. You get x+9 to the power of two. Square root the 25 on the other side as if it were a regular  two sided equation. You get x+9=5. 5-9=x. x=-4

anonymous · Answer

Better?

anonymous · Answer

@ Grazes you gotta b wrong because i have multiple choice and it does not have a 5 in it.. but it have -4.. you not calculating something right..???

anonymous · Answer

Is it wrong. Do you want the method or just you want the results? x = -4 , x = -14

anonymous · Answer

The answer is -4

anonymous · Answer

where did you get 5 o-o

anonymous · Answer

i want the method as well not just the answers.. @ Grazes its two answers though

anonymous · Answer

@Marrioncito i want the method to, pleasee

anonymous · Answer

See quadratic formula; http://en.wikipedia.org/wiki/Quadratic_equation#Quadratic_formula

anonymous · Answer

ok thanks

anonymous · Answer

Then read the message that I wrote ten minutes ago.

anonymous · Answer

ok

anonymous · Answer

And it as a whole ll make sense.

anonymous · Answer

If something isn´t clear, just ask! =)

anonymous · Answer

lol. i got it.. thanks Marrioncito!!

anonymous · Answer

You´re welcome

anonymous · Answer

btw, for  mine, one of the steps should've been -5=x+9 which would make x=-14. This is because the square root of 25 is positive OR negative 5