TS EAMCET · Maths · Quadratic Equation
is a quadratic expression. If is the least real number such that then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
We are given that fx=ax2-bx-a is a quadratic expression, such that fx≤k, ∀x∈R. Hence, we have ax2-bx-a≤K ⇒ax2-bx-a+K≤0 We know that, a quadratic expression Ax2+Bx+C=0 is always negative, if A<0, B2-4AC≤0. Hence,…
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