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6x^{2}+x-12
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6x^{2}+x-12
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3x^{2}+18x-2x-12+3x\left(x-5\right)
Apply the distributive property by multiplying each term of 3x-2 by each term of x+6.
3x^{2}+16x-12+3x\left(x-5\right)
Combine 18x and -2x to get 16x.
3x^{2}+16x-12+3x^{2}-15x
Use the distributive property to multiply 3x by x-5.
6x^{2}+16x-12-15x
Combine 3x^{2} and 3x^{2} to get 6x^{2}.
6x^{2}+x-12
Combine 16x and -15x to get x.
3x^{2}+18x-2x-12+3x\left(x-5\right)
Apply the distributive property by multiplying each term of 3x-2 by each term of x+6.
3x^{2}+16x-12+3x\left(x-5\right)
Combine 18x and -2x to get 16x.
3x^{2}+16x-12+3x^{2}-15x
Use the distributive property to multiply 3x by x-5.
6x^{2}+16x-12-15x
Combine 3x^{2} and 3x^{2} to get 6x^{2}.
6x^{2}+x-12
Combine 16x and -15x to get x.
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