Question

Which of the following equation has sum of its root as 3
1) x2+3x-5

Answer 1

Sol; Given equations are 1) 2x2-3x+9=0 2) -x2+3x-3=0 3) 3x2-3x+3=0 If α,β are the roots of the equation ax2+ bx + c = 0 then α + β = -b / a. Take -x2 + 3x - 3 = 0. then α + β = -3 / -1 = 3. Option 2 is correct.