If an equation has brackets in it one method of solving it is to multiply out the brackets first, for example:
Solve the equation 3(b + 2) = 15
- Write down the equation:
- 3(b + 2) = 15
- Multiply out the brackets. Remember, everything inside the brackets gets multiplied by 3
- 3 × b + 3 ×2 = 15
- When you have multiplied out the brackets you get:
- 3b + 6 = 15
- Next, undo the + 6. In other words, do the inverse and subtract 6 from both sides.
- 3b + 6 - 6 = 15 - 6
- So 3b = 9
Therefore, to find out what b is you need to do the inverse of multiplying by 3 which is dividing by 3.
So b = 3
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