Glencoe Math: Course 2, Volume 2
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Glencoe Math: Course 2, Volume 2 View details
5. Simplify Algebraic Expressions
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Exercise 33 Page 394

An algebraic expression is in simplest form if it has no like terms and no parentheses.

3x-10y

Practice makes perfect

We want to simplify following expression. 5(3x+4y) - 6(2x+5y) Recall that an algebraic expression is in simplest form if it has no like terms and no parentheses. Since the given expression contains like terms and parentheses, we can simplify it. To do this, let's multiply 5 by (3x+4y) and - 6 by (2x+5y) using the Distributive Property. Then we will group like terms using the Commutative Property of Addition.

5(3x+4y) - 6(2x+5y)
5(3x+4y) +[- 6(2x+5y)]
5(3x) + 5(4y) +[- 6(2x+5y)]
5(3x) + 5(4y) +[(- 6)(2x)+(- 6)(5y)]
5(3x) + 5(4y) +(- 6)(2x)+(- 6)(5y)
15x+20y+(- 12x)+(- 30y)
15x+(- 12x)+(- 30y) +20y

Now we can combine like terms using the Distributive Property. 15 x+( - 12 x) + ( - 30 y)+ 20 y [0.3em] = [0.3em] [ 15+( - 12)] x + ( - 30+ 20) y Finally, we will perform the addition and simplify the expression.

[15+(- 12)]x+(- 30+20)y
3x+(- 10y)
3x-10y

The expression written in simplest form is 3x-10y.