Directions: Tell whether each equation is quadratic or not quadratic. If the equation is quadratic but not in standard form, rewrite it to standard form and identify the values of a b, and c. 1. 2d + 3d = 20 2. a2 8a - 18 = 0 3. 12 - 40 = 0 4. (7)(x + 7) = 3x 5.-3m(m + 5) = 0
Remember that in standard form, the equation is written in the form ax2 + bx + c = 0. 3x + x2 = 6 becomes 3x + x2 – 6 = 0, so the standard form is x2 + 3x – 6 = 0. This means the correct answer is a = 1, b = 3, and c = −6.
