No.107 Adding and Subtracting Two Expressions
POINT
Always write the expressions in parentheses first, then remove the parentheses and calculate.
Example
3. Add the two expressions. Then subtract the right expression from the left.
\(4x^2-2x+3\quad,\quad 2x^2+x-3\)
Sum: \(6x^2-x\) Difference: \(2x^2-3x+6\)
Try it yourself.
For each pair, find the sum and the difference obtained by subtracting the right expression from the left.
PRACTICE 01
\(3a+2b\quad,\quad -2a+4b\)
Sum: \(a+6b\) Difference: \(5a-2b\)
PRACTICE 02
\(5x^2+x-2\quad,\quad x^2-3x+1\)
Sum: \(6x^2-2x-1\) Difference: \(4x^2+4x-3\)
PRACTICE 03
\(4a-b\quad,\quad a+3b\)
Sum: \(5a+2b\) Difference: \(3a-4b\)
PRACTICE 04
\(2x^2+3x-1\quad,\quad -x^2+x+4\)
Sum: \(x^2+4x+3\) Difference: \(3x^2+2x-5\)
PRACTICE 05
\(-3m+5n\quad,\quad 2m-n\)
Sum: \(-m+4n\) Difference: \(-5m+6n\)
PRACTICE 06
\(6p^2-p+2\quad,\quad 2p^2+3p-5\)
Sum: \(8p^2+2p-3\) Difference: \(4p^2-4p+7\)