12x2 + 7x + 1 = 12x2 + 3x + 4x + 1
= 3x*(4x + 1) + 1*(4x + 1)
= (4x + 1)*(3x + 1)
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(x + 11)(x - 4)
5x-8 + 7x 12x-8 12x = 8 x = 8/12 x= 2/3
5x+32+7x+8=180. By the laws of commutativity we can thus say that 12x+40=180. Subtracting 40 we get 12x=140. Divide by 12 and you get x=(do it yourself) This has nothing to do with calculus by the way.
Think of this a 12 x-rays + 5 x-rays Makes 17 x-rays. 12x+5x=17x
49/4 or 12.25