Solve the Equation: -38 - ((-14) - (-7)) - 3(7 + 4b) = ?

38((-14)(7))3(7+4b)=? -38-((\text{-}14)-(-7))-3(7+4b)=\text{?}

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Step-by-step video solution

Watch the teacher solve the problem with clear explanations
00:10 Let's solve this problem together.
00:14 Remember, when you multiply negative by negative, it's always positive.
00:20 And if you multiply negative by positive, the result is always negative.
00:32 Again, negative times negative gives you positive.
00:36 But negative times positive results in negative.
00:43 Always do multiplication and division before you do addition and subtraction. Take it step by step.
00:53 Focus on one operation at a time for clarity.
01:11 Use the distribution law. Split thirty-one into thirty and one.
01:16 Next, split twenty-one into twenty and one using the same rule.
01:21 Now, let's group the tens together.
01:24 Then, let's group the ones.
01:27 And that's how we find the solution. Great job!

Step-by-step written solution

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1

Understand the problem

38((-14)(7))3(7+4b)=? -38-((\text{-}14)-(-7))-3(7+4b)=\text{?}

2

Step-by-step solution

To solve this problem, we will simplify the given expression step by step:

First, consider the expression inside the innermost parentheses: (-14)(7)(\text{-}14)-(-7).

Using the rule that subtracting a negative number is equivalent to adding its positive counterpart, we have:

(-14)(7)=-14+7(\text{-}14)-(-7) = \text{-}14 + 7.

Simplifying this gives us 7 -7 .

Now substitute back into the original expression:

38(7)3(7+4b)-38 - (-7) - 3(7 + 4b).

We can handle the next operation as follows:

38(7)-38 - (-7) is equivalent to 38+7 -38 + 7.

Simplifying this gives us: 31 -31 .

Next, consider the term 3(7+4b)-3(7 + 4b). Using the distributive property, distribute 3-3:

3×7=21-3 \times 7 = -21.

3×4b=12b-3 \times 4b = -12b.

Thus, 3(7+4b)=2112b-3(7 + 4b) = -21 - 12b.

Substitute back into the expression:

312112b-31 - 21 - 12b.

Combine the constants:

3121=52-31 - 21 = -52.

The simplified expression is:

5212b-52 - 12b.

Therefore, the solution to the problem is 5212b -52 - 12b .

3

Final Answer

5212b -52-12b

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\( 100-(5+55)= \)

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