Q.Divide 16 into two parts such that twice the square of the larger part exceeds the square of the smaller part by 164.

Let the larger number be \(x\), Then the other number will be \((16 - x)\)

According to the question, \(2 \times x^2 = (16 - x)^2 + 164\) Or, \(2x^2 = 16^2 - 32x + x^2 + 164\) Or, \(2x^2 - x^2 + 32x - 256 - 164 = 0\) Or, \(x^2 + 32x - 420 = 0\) Or, \(x^2 + (42 - 10)x - 42 = 0\) Or, \(x^2 + 42x - 10x - 42 = 0\) Or, \(x(x + 42) - 10(x + 42) = 0\) Or, \((x + 42)(x - 10) = 0\)

∴ Either \((x + 42) = 0\) or \((x - 10) = 0\) When \((x + 42) = 0\), then \(x = -42\) [Negative, not acceptable] When \((x - 10) = 0\), then \(x = 10\)
∴ The larger number is 10 and the smaller number is \(16 - 10 = 6\).
Similar Questions