Quadratic Equations

Q1.The sum of the roots of 5x² + 3x − 10 = 0 is:

• A−3/5
• B3/5
• C−2
• D2

Q2.Two water taps can together fill a tank in 9 and 3/8 hours. The larger tap takes 10 hours less than the smaller one alone. Find the time for the smaller tap alone.

• A15 hours
• B20 hours
• C25 hours
• D30 hours

Q3.The quadratic formula for solving ax² + bx + c = 0 is:

• Ax = (−b ± √D) / a
• Bx = (−b ± √D) / 2a
• Cx = (b ± √D) / 2a
• Dx = −b / 2a ± √D

Q4.For what value of k does the equation 2kx² − 40x + 25 = 0 have real and equal roots?

• Ak = 8
• Bk = 10
• Ck = 16
• Dk = 4

Q5.Which of the following is a quadratic equation?

• Ax³ + 2x + 1 = 0
• Bx² + 3x + 2 = 0
• C2x + 5 = 0
• D1/x + 1 = 0