Rationalise the surd (5✓x-3✓y)
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The conjugate pair of 5✓x-3✓y is 5✓x+3✓y
:.5✓x-3✓y*5✓x+3✓y
:.(5✓x)²-(3✓y)²
:.25x-9y
:.5✓x-3✓y*5✓x+3✓y
:.(5✓x)²-(3✓y)²
:.25x-9y
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