Most Important Selected Qs for JEE AdvancedMathematicsQuadratic Equation

If is a root of the equation 4 x^2+2 x-1=0 then the other root must be

Options

A3 ^3-4
B4 ^3-3
C2 ^2-1
Dall above

Correct answer

C. 2 ^2-1

Step-by-step solution

aligned & 4 x^2+2 x-1=0 & x= -2 4+16 8 & x= -2 2 5 8 = -1 5 4 & If = 5 -1 4 = 18^ & =- [ 5 +1 4 ]=- 36^ & =- 36^ =- [90^ -36^ ]=- 54^ =4 ^3 18^ -3 18^ =4 ^3-3 & =- 36^ =2 ^2 18^ -1=2 ^2-1 aligned

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