y is inversely proportional to the square of x.
A table of values for x and y is shown.
| X | 1 | 2 | 3 | 4 |
| Y | 4 | 1 | 4/9 | 1/4 |
a, Express y in terms of x.
b, work out the posative value of x when y = 25
+538 a. \(y=\frac{4}{x^2}\)
b.\(25=\frac{4}{x^2}\) Multiply x^2 on both sides. Use calculator to find that x=positive or negative 2/5
