AP EAMCET · Maths · Quadratic Equation
Value of for which equations and have a common root
- A
- B
- C
- D none of these.
Answer & Solution
Correct Answer
(C)
Step-by-step Solution
Detailed explanation
Given equations are x3+ax+1=0 ⇒x4+ax2+x=0 …1 And, x4+ax2+1=0 …2 Subtracting equations 1 and 2, we get x-1=0 ⇒x=1 Thus, x=1 is the common root. Hence, 1+a+1=0 ⇒a=-2
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