You may want to review solving equations by factoring and mutiplying polynomials first.

If you know what solutions you want, you can write a quadratic
equation with those solutions. Just take two linear functions
whose *x*-intercepts are those two numbers. For example, if
you want 4 to be a solution, take *x* − 4. If you want
−3 ⁄ 4, you could take *x* +
3 ⁄ 4, but it would be better to use 4*x*
+ 3. Then multiply these two linear functions. For example, if we
want the two solutions to be 4 and
−3 ⁄ 4, we work out (*x* −
4)(4*x* + 3) = 4*x*^{2} − 13*x*
− 12. Finally, we set that equal to 0 to get our equation,
which is 4*x*^{2} − 13*x* − 12 =
0.

Remember, an equation must *always* have two sides
separated by an equals sign. In these problems, though, I'll write
the “= 0” for you.