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**Learn the steps to do the subtraction of algebraic expressions**:

- Arrange the terms of the given expressions in the same order.
- Write the given expressions in two rows in such a way that the like terms occur one below the other, keeping the expression to be subtracted in the second row.
- Change the sign of each term in the lower row from \(+\) to \(-\) and from \(-\) to \(+\).
- After changing the signs of the terms in the lower row, add the terms column-wise.

Example:

Subtract \(3x² - 6x - 4\) from \(5 + x - 2x²\).

That is, we have to find the difference of \(5 + x - 2x^2\) and \(3x^2- 6x - 4\).

Arrange the terms of the given expression in the same order.

$\begin{array}{l}\phantom{\rule{0.147em}{0ex}}-\phantom{\rule{0.147em}{0ex}}2x\xb2\; +\phantom{\rule{0.147em}{0ex}}x\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}5\\ \phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}3x\xb2-\phantom{\rule{0.147em}{0ex}}6x\phantom{\rule{0.147em}{0ex}}-\phantom{\rule{0.147em}{0ex}}4\\ \phantom{\rule{0.147em}{0ex}}(-)\phantom{\rule{0.147em}{0ex}}(+)\phantom{\rule{0.147em}{0ex}}(+)\phantom{\rule{0.147em}{0ex}}\phantom{\rule{0.147em}{0ex}}\\ \underset{\xaf}{\overline{-\phantom{\rule{0.147em}{0ex}}5x\xb2\; +\phantom{\rule{0.147em}{0ex}}7x\phantom{\rule{0.147em}{0ex}}+\phantom{\rule{0.147em}{0ex}}9}}\end{array}$