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Substitution into a formula

Substitution into a formula.

  • Identify the value of each letter before substituting.
  • Replace every occurrence of a letter with its value. Put negative values in brackets.
  • Follow the order of operations: powers, multiplication or division, then addition or subtraction.

Example 1

Use the formula to calculate when .

Replace each letter with its value. Keep negative values in brackets.Multiply before adding or subtracting.

Example 2

Use the formula to calculate when .

Replace each letter with its value. Keep negative values in brackets.Multiply before adding or subtracting.

Your turn

Question 1

Use the formula to calculate when .

Check answer
Replace each letter with its value. Keep negative values in brackets.Multiply before adding or subtracting.
Question 2

Use the formula to calculate when .

Check answer
Replace each letter with its value. Keep negative values in brackets.Multiply before adding or subtracting.
Question 3

Use the formula to calculate when .

Check answer
Replace each letter with its value. Keep negative values in brackets.Multiply before adding or subtracting.
Question 4

Use the formula to calculate when .

Check answer
Replace each letter with its value. Keep negative values in brackets.Multiply before adding or subtracting.
Question 5

Use the formula to calculate when .

Check answer
Replace each letter with its value. Keep negative values in brackets.Multiply before adding or subtracting.
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