Guided Practice:
Solve the following equations for the variable. Remember, if there is a squared term in the equation you might have one solution, two solutions, no solutions, or infinitely many solutions (“all real numbers”).
Practice Problems:
Pre-Algebra
A complete Pre-Algebra curriculum for middle school students
Pre-Algebra 
How would you solve 2x(squared) + 7x – 15=0 ?
That’s a quadratic equation that contains both a squared variable as well as a linear variable. That’s more of an Algebra 1 topic than Pre-Algebra — depending on the type of quadratic equation there are a number of different strategies you might want to choose. For more information on Quadratics, this is a good resource from Khan Academy: https://www.khanacademy.org/math/algebra/quadratics