Question

If x²+1/x=5,find the value of x³+1/x³

Answer 1

Answer:

We have ,

∠ABC + ∠BCA + ∠CAB = 180°

=>90° + ∠BCA + ∠CAB = 180°

=>∠BCA + ∠CAB = 180°

=> \frac{1}{2}

2

1

(∠BCA + ∠CAB ) = \frac{1}{2}

2

1

X 90°

=> \frac{1}{2}

2

1

(∠BCA + \frac{1}{2}

2

1

∠CAB = 45°

=> ∠OCA + ∠OCA = 45°

=> ∠AOC + ∠OCA + ∠OCA = ∠AOC + 45° (Adding ∠AOC on both side )

=> 180° = ∠AOC + 45°

So, ∠AOC = 135° Ans

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