WAEC - Mathematics (2000 - No. 27)
Given that \(x = -\frac{1}{2}and \hspace{1mm} y = 4 \hspace{1mm} evaluate \hspace{1mm} 3x^2y+xy^2\)
-5
-1
4
11
Explicação
\(x = -\frac{1}{2}\), y = 4
3x\(^2\)y + xy\(^2\)
3\(\left[-\frac{1}{2}\right]^2 \times 4 + \left(\frac{-1}{2}\right)(4)^2\)
3\(\times \frac{1}{4} \times 4 -\frac{1}{2} \times 16\)
3 - 8 = -5
3x\(^2\)y + xy\(^2\)
3\(\left[-\frac{1}{2}\right]^2 \times 4 + \left(\frac{-1}{2}\right)(4)^2\)
3\(\times \frac{1}{4} \times 4 -\frac{1}{2} \times 16\)
3 - 8 = -5