Answer:288
Explanation:
If y varies directly as x^2
i.e y varies directly as x * x
and y =72, when x =3
therefore, 72 = k* 3*3 9 (where k is constant)
72=k9
k = 72/9
=8
The value of y, when x =6 will be
y = 8 * 6^2
8*36 = 288
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