is a linear equation and is a quadratic equation.
Substitute into the quadratic equation to create an equation which can be factorised and solved.
Rearrange the equation to get all terms on one side, so subtract and from both sides:
Factorise this equation:
If the product of two numbers is zero, then one or both numbers must also be equal to zero. To solve, put each bracket equal to zero.
To find the values for , substitute the two values for into the original linear equation.
The answers are now in pairs: when , and when ,