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15x² / 12xy²
= (15:3)/(12:3) . x^2-1 / y²
= 5x / y²
b)
√5p = 3q-2
(√5p)² = (3q-2)²
5p = (3q)²+2.3q.(-2)+(-2)²
5p = 9q²-12q+4
p = (9q²-12q+4)/5