3(13 + 4x) = 56

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Step-by-step explanation:

Step 1: Simplify both sides of the equation.

3 (13 + 4x) = 56

(3) (13) + (3) (4x) = 56(Distribute)

39 + 12x = 56

12x + 39 = 56

Step 2: Subtract 39 from both sides.

12x + 39 − 39 = 56 − 39

12x = 17

Step 3: Divide both sides by 12.

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a= -1

b= 3

c= -7

The Quadratic Formula uses the "a", "b", and "c" from "ax2 + bx + c", where "a", "b", and "c" are just numbers; they are the "numerical coefficients" of the quadratic equation they've given you to solve.

Step-by-step explanation: