5 Rearrange the equation to make I the subject.

5 • Multiply both sides by :

5 • Multiply both sides by :

5 • Multiply both sides by :

• Expand the brackets:

5 • Multiply both sides by :

• Expand the brackets:

5 • Multiply both sides by :

• Expand the brackets:

• Move everything containing I to one side:

5 • Multiply both sides by :

• Expand the brackets:

• Move everything containing I to one side:

5 • Multiply both sides by :

• Expand the brackets:

• Move everything containing I to one side:

• Collect like terms of and factorise:

5 • Multiply both sides by :

• Expand the brackets:

• Move everything containing I to one side:

• Collect like terms of and factorise:

5 • Multiply both sides by :

• Expand the brackets:

• Move everything containing I to one side:

• Collect like terms of and factorise:

• Divide both sides by :

5 • Multiply both sides by :

• Expand the brackets:

• Move everything containing I to one side:

• Collect like terms of and factorise:

• Divide both sides by :

5 • Multiply both sides by :

• Expand the brackets:

• Move everything containing I to one side:

• Collect like terms of and factorise:

• Divide both sides by :

• Square both sides:

5 • Multiply both sides by :

• Expand the brackets:

• Move everything containing I to one side:

• Collect like terms of and factorise:

• Divide both sides by :

• Square both sides: