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SSC Question
If x2 - 8x + 1= 0, then what is the value of  
  • a)
    18
  • b)
    34
  • c)
    40
  • d)
    62
Correct answer is option 'D'. Can you explain this answer?

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Answers

1616
Feb 26, 2022
X^2=8x-1
8x-1+1/(8x-1)
64x^2+1-16x=8x-1
64x^2+1+1-24x=0
64x^2-24x+2=0
32x^2-12x+1=0
32x^2-8x-4x+1=0
8x(4x-1)-1(4x-1)=0
(8x-1)(4x-1)=0
x=1/8.
x=1/4
.

X^2=8x-18x-1+1/(8x-1)64x^2+1-16x=8x-164x^2+1+1-24x=064x^2-24x+2=032x^2-12x+1=032x^2-8x-4x+1=08x(4x-1)-1(4x-1)=0(8x-1)(4x-1)=0x=1/8.x=1/4.

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X^2=8x-18x-1+1/(8x-1)64x^2+1-16x=8x-164x^2+1+1-24x=064x^2-24x+2=032x^2-12x+1=032x^2-8x-4x+1=08x(4x-1)-1(4x-1)=0(8x-1)(4x-1)=0x=1/8.x=1/4.
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