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Answer:
answer below
Step-by-step explanation:
Q1) (b) 180
16.1²-8.9² = (16.1+8.9)(16.1-8.9) a²-b² = (a+b)(a-b)
= 25 × 7.2
= 180
Q2) (b) 7
x + 1/x = 3
∴ (x + 1/x)² = (3)²
(x)² + 2 × x × 1/x + (1/x)² = 9
x² + 2 + 1/x² = 9
x² + 1/x² = 9-2
x² + 1/x² = 7
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