How do you solve #9x^2+11x+18=-10x+8#?
1 Answer
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,
Explanation:
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:
It says
Anyway, applying this formula to our equation, we need to put
we get the following:
i.e.
i.e.
i.e.
so
i.e.
Q.E.D.