book Maths Puzzle Numerical Ability

Solve using the quadratic equation:
x^2 - 3x - 23 = 5

3x^2 - 2x = 15x - 10

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book Other Question

A new manufacturing machine will cost $165,000 and will generateafter-tax cash inflows of $50,000 per year for five years. Find the Net Present Value if the firm uses a 6% opportu 1.Let r be the number, that results when both the base and the exponent of a^b are tripled, where a and b are positive. If r=a^bx^b, where x is positive, then x equals?