How do you solve #x^2+4x=9# using the quadratic formula?
is the quadratic formula where:
a=number in front of x^2 (which is 1)
b= number in front of x (a coefficient, which is 4
c= the constant (which is -9)
First, you want to make sure the equation is in the form;
you then get the equation:
As stated above, you know the values of a, b and c.
Simply sub these into the quadratic formula.
hope it helps
Rearrange the formula to equal zero
The coefficients of the expression are:
a=1, b=4, c=-9
Substitute into the quadratic equation.