JAMB - Mathematics (2025 - No. 14)
A varies directly as b\(^2\) when A = 4, b = 1. Find A when b = 2
12
14
16
11
Erläuterung
A ∝ b\(^2\) so A = k b\(^2\).
Substitute: 4 = k · 1\(^2\),
k = 4.
When b = 2,
A = 4 · 4 = 16.
A ∝ b\(^2\) so A = k b\(^2\).
Substitute: 4 = k · 1\(^2\),
k = 4.
When b = 2,
A = 4 · 4 = 16.