Mathematics for IGCSE & O level - Equations (Section 7 - No. 5)
If you want to rearrange the formula P = 2(l + w) to solve for 'l' (length), what's the correct first step?
Subtract 'w' from both sides.
Divide both sides by 2.
Divide both sides by 'w'.
Subtract 2 from both sides.
解释
First, divide both sides by 2: P/2 = l + w.