JAMB - Mathematics (1981 - No. 30)
The difference between the length and width of a rectangle is 6cm and the area is 135cm2. What is the length?
25cm
18cm
15cm
24cm
27cm
Explicació
Area = L x B
L - B = 6
L = 6 + B
area = 135
B(6 + B) = B2 + 6B - 135 = 0
B = 9
L = 6 + 9
= 15
L - B = 6
L = 6 + B
area = 135
B(6 + B) = B2 + 6B - 135 = 0
B = 9
L = 6 + 9
= 15