Algebramedium · Past Paper
What is the value of k for which the equation 4x^2 - 12x + k = 0 has equal roots?
A9
B3
C6
D36
✓ Correct Answer: A — 9
D = (-12)^2 - 4(4)(k) = 0 => 144 - 16k = 0 => k = 9.
Share this question
More from Algebra
- If P(x) = x^2 - 1, find P(P(1)).
- If the length of a rectangle is reduced by 5 units and breadth is increased by 3 units, the area is reduced by 9 sq units. If we increase length by 3 and breadth by 2, area increases by 67. Find length.
- Solve: x^2 + 6x + 5 = 0.
- Factorize 3x + 3y + ax + ay.
- If 2x + 5 = 5x - 4, what is x?