exam Maths Puzzle Numerical Ability

Solve. sqrt x-1 =x-3

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exam Other Question

I just want the derivation of following formula

The annual payment of debt of Rs. P in t years in equal installments at the rate of interest R% per annum when equal installment
Simplify

2x - 10/x2nd power - 25 divided by x2nd power - 2x -15/x2nd power - 4x -5