Test 4
Ch. 4 Quadratic Equations Q. Each root of x²– bx + c = 0 is decreased by 2. The resulting equation is x²+2x + 1 = 0, then (a) b = 6, c = 9    (b) b = 3, c = 5 (c) b = 2, c = –1 (d) b –4, c = 3 Sol. For x²– bx + c = 0 we have α + β = b/1=b 2 + 2 =b b = 4 α×β = c…