Mathematics for IGCSE & O level - Equations (Section 5 - No. 1)
Which of the following is the correct expression for the area of a rectangle with length (x + 5) and width 3?
3x + 5
3x + 15
x + 8
3x
Wyjaśnienie
Area = length * width, so 3 * (x + 5) = 3x + 15.