If you mean: 3d2+20d+12 then it is (3d+2)(d+6) when factored with the help of the quadratic equation formula
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x=12
12 h = - 72
- 4 - 12 = -16 You are subtracting from an already negative number making it more negative.
72
is the x before the 21 is multiplication then I need a value for x to solve, but for the sake of an answer I will assume it's 6x-12=21 6x-12=12 +12 +12 6x=24 /6 /6 x=4 is the x before the 21 is multiplication then I need a value for x to solve, but for the sake of an answer I will assume it's 6x-12=21 6x-12=12 +12 +12 6x=24 /6 /6 x=4