Question

If one root of the quadratic equation a x square + C is equal to zero is double the other then show that 2b square is equal to 9AC

Answer 1

ax² + bx +c = 0 has roots α, 2α
 so 3α = -b/a
2α² = c/a
 solving...
2(-b/3a)² = c/a
2b² = 9ac

Answer 2

Answer:

Step-by-step explanation: