Solve for Unknowns in the Equation: 46 - (98 + 3a) - (27b:3b/a - 7)

Algebraic Simplification with Division Operations

46(98+3a)(27b:3ba7)=? 46-(98+3a)-(27b:\frac{3b}{a}-7)=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:00 Solve
00:03 Negative times positive is always negative
00:15 Division is also multiplication by the inverse
00:24 Negative times negative is always positive
00:36 Let's reduce what we can
00:39 Let's factor 27 into factors 3 and 9
00:51 Using the distributive law, let's split 46 into 40 plus 6
00:55 Using the distributive law, let's split 98 into 90 plus 8
00:59 Let's reduce what we can
01:04 Let's group the factors
01:13 Let's use the commutative law and arrange the exercise for easier solving
01:36 And this is the solution to the question

Step-by-step written solution

Follow each step carefully to understand the complete solution
1

Understand the problem

46(98+3a)(27b:3ba7)=? 46-(98+3a)-(27b:\frac{3b}{a}-7)=\text{?}

2

Step-by-step solution

To solve this problem, we'll follow these steps:

  • Step 1: Simplify the expression inside the first parentheses: 98+3a 98 + 3a .
  • Step 2: Simplify the expression inside the second parentheses, particularly the term 27b:3ba7 27b:\frac{3b}{a} - 7 .
  • Step 3: Substitute simplified expressions back into the original expression.
  • Step 4: Perform the necessary calculations to reach a simplified final expression.

Now, let's work through each step:

Step 1: Simplify 98+3a 98 + 3a . This remains as is within its parentheses.

Step 2: Simplify the term 27b:3ba7 27b:\frac{3b}{a} - 7 .

The fraction 27b:3ba=27b×a3b=9a 27b:\frac{3b}{a} = 27b \times \frac{a}{3b} = 9a (assuming b0 b \neq 0 ).
The expression inside becomes 9a7 9a - 7 .

Step 3: Substitute back:

The original expression is now:

46(98+3a)(9a7) 46 - (98 + 3a) - (9a - 7) .

Step 4: Simplify:

First, distribute the subtraction across both terms inside their parentheses:

46983a9a+7 46 - 98 - 3a - 9a + 7 .

Combine like terms by performing arithmetic operations:

4698+73a9a=(46+798)(3a+9a) 46 - 98 + 7 - 3a - 9a = (46 + 7 - 98) - (3a + 9a) .

This simplifies to 4512a -45 - 12a .

Therefore, the solution to the problem is 4512a -45-12a .

3

Final Answer

4512a -45-12a

Key Points to Remember

Essential concepts to master this topic
  • Order: Simplify divisions first, then distribute subtraction signs carefully
  • Division Rule: 27b:3ba=27b×a3b=9a 27b:\frac{3b}{a} = 27b \times \frac{a}{3b} = 9a
  • Check: Substitute values: if a=1, then -45-12(1)=-57 ✓

Common Mistakes

Avoid these frequent errors
  • Incorrectly handling the division notation
    Don't treat 27b:3b/a as simple multiplication = wrong simplification! The colon represents division, so 27b:(3b/a) means 27b÷(3b/a) = 27b×(a/3b). Always convert division notation to multiplication by the reciprocal.

Practice Quiz

Test your knowledge with interactive questions

\( 70:(14\times5)= \)

FAQ

Everything you need to know about this question

What does the colon (:) mean in this expression?

+

The colon represents division. So 27b:3ba 27b:\frac{3b}{a} means 27b÷3ba 27b ÷ \frac{3b}{a} , which equals 27b×a3b=9a 27b \times \frac{a}{3b} = 9a .

Why does 27b÷(3b/a) become 9a?

+

When dividing by a fraction, multiply by its reciprocal. So 27b÷3ba=27b×a3b 27b ÷ \frac{3b}{a} = 27b \times \frac{a}{3b} . The b's cancel: 27b×a3b=27a3=9a \frac{27b \times a}{3b} = \frac{27a}{3} = 9a .

How do I distribute the negative signs correctly?

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Distribute carefully! (98+3a)=983a -(98+3a) = -98-3a and (9a7)=9a+7 -(9a-7) = -9a+7 . Remember that subtracting a negative becomes positive.

What if b equals zero in this problem?

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If b = 0, then 27b=0 27b = 0 and 3ba=0 \frac{3b}{a} = 0 , making the division 0÷0 0÷0 which is undefined. The problem assumes b ≠ 0.

Can I solve this step by step in a different order?

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Yes! You could work left to right: 46(98+3a)=523a 46-(98+3a) = -52-3a , then subtract the second parentheses. Both methods give the same final answer: 4512a -45-12a .

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