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= 3√5 (3√5 - √2) - √2 (3√5 - √2)
= 9.5 - 3√10 - 3√10 + 2
= 45 - 6√10 + 2
= 47 - 6√10
16) 3²ˣ⁻² = (¹/₉)ˣ₊⁵
= (3⁻²)ˣ₊⁵
= 3⁻²ˣ⁻¹⁰
2x-2 = -2x-10
2x+2x = -10+2
4x = -8
x = -2
17)