If α and β are roots of x^2 – (-2)x + (-63) = 0, find α^2 + β^2.
Note
Use Vieta's formulas instead of solving the quadratic. For x^2 - (-2)x + (-63) = 0, the roots α and β satisfy α + β = -2 and αβ = -63. The expression we need is α^2 + β^2. Use the identity α^2 + β^2 = (α + β)^2 - 2αβ. So α^2 + β^2 = (-2)^2 - 2(-63) = 4 - (-126) = 130. This is why the correct answer is 130.
