To simplify the expression \((18x + 9y) + (2x + 6y) \cdot (x + y)\), we need to break it down step by step:
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First, we calculate the multiplication \((2x + 6y) \cdot (x + y)\):
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Distributing \(2x\): \[ 2x \cdot x + 2x \cdot y = 2x^2 + 2xy \]
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Distributing \(6y\): \[ 6y \cdot x + 6y \cdot y = 6xy + 6y^2 \]
Now combine these results: \[ (2x + 6y) \cdot (x + y) = 2x^2 + 2xy + 6xy + 6y^2 = 2x^2 + 8xy + 6y^2 \]
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Next, we combine this result with the first part of the expression: \[ (18x + 9y) + (2x^2 + 8xy + 6y^2) \]
Combining like terms:
- The \(x^2\) term: \(2x^2\)
- The \(xy\) terms: \(8xy\)
- The \(x\) terms: \(18x\)
- The \(y\) terms: \(9y + 6y^2\) since we only have the constant \(y\) term.
So, the final simplified expression is: \[ 2x^2 + 18x + 8xy + 9y + 6y^2 \]
Thus, the coefficients to fill the blanks, if asked for in the final polynomial, are:
- Coefficient of \(x^2\): 2
- Coefficient of \(xy\): 8
- Coefficient of \(x\): 18
- Coefficient of \(y\): 9
- Coefficient of \(y^2\): 6
Please confirm the specific blanks you wanted to fill if this is not what you were looking for!