SSC CGL 2014 Tier 1 27 April shift 7

Question 110

If $$\cos\pi$$x$$=x^{2}-x+\frac{5}{4}$$ the value ue of x will be

Solution

As we can see, the least value of the expression is 5/4 = 1.25>1.
Cos value cannot be greater than 1. If it is greater than 1, it means that adjacent side > hypotenuse. Hence, hypotenuse will not remain the hypotenuse anymore. Hence, option D is the right answer.

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