a. \( \left(8 x^{2}-2 x+1\right)+\left(3 x^{2}+5\right. \) b. \( \left(2 x^{3}-3 x^{7}+5 x-1\right)+ \) c. \( \left(7 x^{4}-5 x^{5}+4 x^{2}-7\right)+(x \) d. \( (-5 z+2 y)+(2 z-5 y-7 \) e. \( \left(x y^{2}-3 x^{7}-y^{2}+x^{2} y\right)+( \)
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Bonus Knowledge
When adding polynomials, a fun tip is to combine like terms, which means you group and sum the coefficients of terms that have the same variable and exponent. For example, in the expression \(8x^2 - 2x + 1 + 3x^2 + 5\), you'd combine \(8x^2\) and \(3x^2\) to get \(11x^2\), and then handle the rest similarly! A common mistake while adding polynomials is forgetting to include all terms, especially constants. For instance, in expression (d), if you miss aligning the \( -5y \) with \( 2y \), you might end up with an incorrect coefficient for \(y\) in your final answer. Keeping your terms organized is the key to avoiding such blunders!