Question

Simplify- 3ab-9ab+7ab

Answer 1

Since its adding and subtracting just add the coefficients of similar terms (coefficient is the number in front, term is the coefficient and variables, similar terms are terms that have the same variables) 
3ab-9ab+7ab
3-9=-6: -6ab+7ab
-6+7=1: 1ab or ab :)

Answer 2

The simplified form of the expression $3ab-9ab+7ab$ is $\boxed{ab}$.

Further explanation:

It is given that the expression is $3ab-9ab+7ab$.

To simplify the given expression we will use BODMAS rule.

BODMAS stands for Bracket, Of, Division, Multiplication, Addition and Subtraction. BODMOS explains the order operation to simplify any expression.

For the solution of any expression first solve the brackets followed by of that is roots or powers then division, multiplication, addition and subtraction and the short form of these operations is BODMAS.

In the given expression it only addition and subtraction. So according to BODMAS first we will add the terms of expression then subtract.

In expression $3ab-9ab+7ab$ the first and last terms are with positive sign, so first we will add these two terms as follows,

$\boxed{\begin{aligned}3ab-9ab+7ab&=3ab+7ab-9ab\\&=10ab-9ab\end{aligned}}$  

Now we will subtract the above two terms of the expression  

$\boxed{\begin{aligned}10ab-9ab&=(10-9)ab\\&=ab\end{aligned}}$  

From the above simplification the simplified form of the expression $1ab-9ab+7ab$ is $\boxed{ab}$.

Learn more:

1. Problem on equivalent expression in simplified form: brainly.com/question/1394854

2. Problem on general form of equation of circle: brainly.com/question/1506955

3. Problem on scientific notation of a given number: brainly.com/question/4736384

Answer details:

Grade: Middle School

Subject: Mathematics

Chapter: Simplification

Keywords:  Expression, equation, simplification, addition, ab , subtraction, BODMAS, division, multiplication, 3ab-9ab+7ab , term, sign, brackets, operation.