Question

If C = x + 6 and D = 3x - 6 + 4x2, find an expression that equals C + 3D in

standard form.
Help please

Answer 1

12x²+10x-12

Explanation:

x+6 + 3(3x-6+4x²)

x+6 +9x-18+12x²

12x²+10x-12