How do you solve #9x^2+11x+18=-10x+8#?
1) Rearrange equation so that it is in the form
2) (Learn by heart and) use the quadratic formula to solve the equation
Answers are, in this case,
Ohkay, let's do this.
1) Rearrange every term on one side, say to the left.
We now have:
(the sign-change occurs because the terms "crossed" the equal sign)
Now, you can simplify a bit. We have:
This is a quadratic equation of the form
To solve this, you need the quadratic formula which is, in its general form:
Anyway, applying this formula to our equation, we need to put
we get the following: