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4x^{2}+12x+2x+\frac{x+8}{2}
Use the distributive property to multiply 2x by 2x+6.
4x^{2}+14x+\frac{x+8}{2}
Combine 12x and 2x to get 14x.
\frac{2\left(4x^{2}+14x\right)}{2}+\frac{x+8}{2}
To add or subtract expressions, expand them to make their denominators the same. Multiply 4x^{2}+14x times \frac{2}{2}.
\frac{2\left(4x^{2}+14x\right)+x+8}{2}
Since \frac{2\left(4x^{2}+14x\right)}{2} and \frac{x+8}{2} have the same denominator, add them by adding their numerators.
\frac{8x^{2}+28x+x+8}{2}
Do the multiplications in 2\left(4x^{2}+14x\right)+x+8.
\frac{8x^{2}+29x+8}{2}
Combine like terms in 8x^{2}+28x+x+8.
4x^{2}+12x+2x+\frac{x+8}{2}
Use the distributive property to multiply 2x by 2x+6.
4x^{2}+14x+\frac{x+8}{2}
Combine 12x and 2x to get 14x.
\frac{2\left(4x^{2}+14x\right)}{2}+\frac{x+8}{2}
To add or subtract expressions, expand them to make their denominators the same. Multiply 4x^{2}+14x times \frac{2}{2}.
\frac{2\left(4x^{2}+14x\right)+x+8}{2}
Since \frac{2\left(4x^{2}+14x\right)}{2} and \frac{x+8}{2} have the same denominator, add them by adding their numerators.
\frac{8x^{2}+28x+x+8}{2}
Do the multiplications in 2\left(4x^{2}+14x\right)+x+8.
\frac{8x^{2}+29x+8}{2}
Combine like terms in 8x^{2}+28x+x+8.