x=0.58, x= -1.38
Quadratic formula is:
(-b-/+ sqrt b^2-4ac)/2a
We need to get the function to equal zero so we subtract 4 from both sides.
5x^2+4x-4=0 is out new equation.
a=5, b=4 and c=-4
Now we can solve by plugging in the variables!
-4+ sqrt 4^2-4(5)(-4)/2(5)= 0.5797
Do the same with subtracting because of the plus OR minus
-4-sqrt 4^2-4(5)(-4)/2(5)= -1.3797
Rounded to the nearest 100th will be:
x= -1.38, x=0.58
You can check your answer by plugging them back into the original function— you should get zero. :)