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Question
If x = 3, y = 2 and z = 1; find the value of 3x2 − 5y2
Solution
x = 3, y = 2, z = 1
3x2 − 5y2 = 3(3)2 − 5(2)2
= 3 × 9 − 5 × 4
= 27 − 20
= 7
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