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SSC Question
If x
^{2 }
- 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?
Related Test
SSC CPO Exam Paper 03 July 2017 (Shift-1)
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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
.
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Answer this doubt
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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