Subtraction of algebraic expression — lesson. Mathematics State Board, Class 7.

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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} - 2 x ² + x + 5 \\ + 3 x ² - 6 x - 4 \\ (-) (+) (+) \\ \underline{\bar{- 5 x ² + 7 x + 9}} \end{array}

Did you find an error?

2. Subtraction of algebraic expression