TS EAMCET · Maths · Functions
For the value of does not lie in the interval
- A
- B
- C
- D
Answer & Solution
Correct Answer
(D)
Step-by-step Solution
Detailed explanation
y=x+2x+5x+6 ⇒xy+6y=x2+7x+10 ⇒x2+7-yx+10-6y=0 For x to be real, ∆≥0 ⇒7-y2-410-6y≥0 y2-14y+49-40+24y≥0 ⇒y2+10y+9≥0 ⇒y+1y+9≥0 ⇒y∈(-∞,-9]∪[-1,∞)
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