Use the quadratic formula to find exact solutions
9x^2+6x=-5

Question

lilg132 · Answer

do you know about the quadratic formula?

lilg132 · Answer

first you will need to make the equation = 0

to do that you bring the -5 over to the other side which will give you

9x^2 + 6x + 5 = 0

you can also use factorisation but using the formula will get you the answer every time

without trial and error

anonymous · Answer

then do you just solve for x

lilg132 · Answer

well yes but using the quadratic formula

and im guessing you know the quadratic formula

lilg132 · Answer

but remember to use the formula you need to first have the equation in order of

$$ax ^{2} + bx + c = 0$$

lilg132 · Answer

which we have done

anonymous · Answer

http://www.purplemath.com/modules/quadform.htm here's a site that explains how to do this kind of problem

lilg132 · Answer

and so now we know the values of a, b and c to put in the formula

lilg132 · Answer

a = 9
b = 6
c = 5