Subtract polynomials: $ \, \color{blue}{ 4x^4-2x } \, $ , $ \, \color{orangered}{ 6x-2x^4 }$.

$$ \left( \color{blue}{4x^4-2x} \right) - \left( \color{orangered}{6x-2x^4} \right) = 6x^4-8x $$

Step 1: First we have to write polynomials in descending order.

$$ \begin{aligned} P(x) &= 4x^4-2x \\ Q(x) &= -2x^4+6x \\ \end{aligned} $$

Step 2: Write second polynomial below the first one. Making sure like terms are lined up.

$$ \begin{array}{lrr} & 4x^4 & -2x \\ \color{red}{ - } & -2x^4 & 6x \\ \hline \end{array} $$

Step 3: Change ALL the signs in the second row.

$$ \begin{array}{lrr} & 4x^4 & -2x \\ \color{red}{ - } & 2x^4 & -6x \\ \hline \end{array} $$

Step 4: Combine like terms (add each column):

$$ \begin{array}{lrr} & 4x^4 & -2x \\ \color{red}{ - } & 2x^4 & -6x \\ \hline & 2x^4 & 4x \end{array} $$

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