One way that double number lines are similar to finding equivalent ratios is that to find your answer on a double number line, you add equivalent ratios to your number line.
The answer is -7 using the formula.
-6x8 equals -48 and adds to give you positive two
A quadratic equation has to have x^2....it does not necessarily have to have a constant.
7x^2 + 14x = 0
x^2 + 3x - 5 = 0
x^2 - x = 3x + 7
these are quadratic