TS EAMCET · Maths · Quadratic Equation
If then
- A
- B
- C
- D
Answer & Solution
Correct Answer
(B)
Step-by-step Solution
Detailed explanation
x=2+223+213⇒x-2=223+213 Cubing both sides i.e. x-23=223+2133 ⇒x3-6x2+12x-8=22+21+3·223·213·223+213 (Using a-b3=a3-3a2b+3ab2-b3, a+b3=a3+b3+3aba+b, amn=amn) ⇒x3-6x2+12x-8=6+3·2·x-2 (Using am·an=am+n) ⇒x3-6x2+6x=2
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