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Which of the following equations has a root in common with
x2 - 6x + 5 = 0?
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Answer / siheng
the question was lifted from the SAT test prep source
the choices given were
A) x^2 + 1 = 0
B) x^2 - x - 2 = 0
C) x^2 - 10x - 5 = 0
D) 2x^2 - 2 = 0
E) x^2 - 2x - 3 = 0
the roots are 5, 1
but which of the following equations, a, b, c, d or e has a
root in common with x^2 - 6x + 5
the answer is D) 2x^2 -2 = 0
this is because when factored, the equation becomes
2(x^2 - 1) = 0
and the root of the equation therefore is
x^2 - 1 = 0
x^2 = 1
x = 1 ^1/2
x = 1 (since the square root of 1 is 1), which is common
with x^2 - 6x + 5
| Is This Answer Correct ? | 5 Yes | 1 No |
x2 -6x +5 =0
(since -5*-1=5 and their sum =-6)
(x-5) (x-1)=0
x=5,1
| Is This Answer Correct ? | 1 Yes | 0 No |
Answer / guest
x2-6x+5=0
so,
x2-6x+5=(x-1)(x-5)=0
x-1=0;x-5=0
x=1, x=5
| Is This Answer Correct ? | 2 Yes | 3 No |
Answer / mohan
2x^2-12x+10
roots are 1,5,.common root with the given eqn
| Is This Answer Correct ? | 0 Yes | 2 No |
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