Chapter 1: Q49. (page 16)

Simplify each expression
$7 a + 3 b - 4 a - 5 b$

Short Answer

Expert verified

$7 a + 3 b - 4 a - 5 b$ is simplified to $3 a - 2 b$

Step by step solution

- Write properties of real numbers

Properties of real numbers are written in following table:

For any real numbers $a, b,$ and $c :$
Property	Addition	Multiplication
Commutative	$a + b = b + a$	$a \cdot b = b \cdot a$
Associative	$(a + b) + c = a + (b + c)$	$(a \cdot b) \cdot c = a \cdot (b \cdot c)$
Identity	$a + 0 = a = 0 + a$	$a \cdot 1 = a = 1 \cdot a$
Inverse	$a + (- a) = 0 = (- a) + a$	If $a \neq 0$ , then $a \cdot \frac{1}{a} = 1 = \frac{1}{a} \cdot a$
Distributive	$a (b + c) = a b + a c and (b + c) a = b a + c a$

- Simplify by grouping same variables

To simplify given equation, first use commutative property of addition in middle most two terms then distributive property to group coefficients of same variable as shown below

$\begin{matrix} 7 a + 3 b - 4 a - 5 b = 7 a - 4 a + 3 b - 5 b \\ = (7 - 4) a + (3 - 5) b \end{matrix}$

- Simplify

To simplify $(7 - 4) a + (3 - 5) b$ , evaluate parentheses terms as shown below

$(7 - 4) a + (3 - 5) b = 3 a - 2 b$

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Simplify each expression
$7 a + 3 b - 4 a - 5 b$

Short Answer

Step by step solution

- Write properties of real numbers

- Simplify by grouping same variables

- Simplify

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Simplify each expression7a+3b-4a-5b

Short Answer

Step by step solution

- Write properties of real numbers

- Simplify by grouping same variables

- Simplify

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Geometry

Probability and Statistics

Applied Mathematics

Theoretical and Mathematical Physics

Pure Maths

Statistics

Study anywhere. Anytime. Across all devices.

Simplify each expression
$7 a + 3 b - 4 a - 5 b$