<span>The difference of a number times 4 and 9 equals 5. Let the number be n. Then 4n - 9 = a number times 4 The difference of a number times 4 AND 9 equals 5 comes out to be:
4n - 9 = 5
Add 9 to both sides: 4n = 14. Then n = 14/4 = 7/2 (answer)
Note that 14 less 9 is 5. This is one way in which you can check this result.
Students should be able to find the x-intercepts of a quadratic function using both factoring and completing the square. All that should be given to students is the standard form of a quadratic equation in the form y = ax^2 + bx + c.