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

Question

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

Video Solution

Solution Steps

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 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 .

Answer

4512a -45-12a