help with algebra?

1) Is square root x squared =x (true for all values of x)? Explain your answer.

2). For the function, y= 1/x-1. Give the y values for x= -2,1,0,1,2,3. Show work please.

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  • 1 decade ago
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    1) First, you can't square root a negative, so sqrt(-3) = impossible. sqrt and ^2 (squared) are inverse functions, they undo one another. The sqrt(49)=7, and 7^2=49, and sqrt(49)^2=49. This will work for all number > or = to zero.

    2) Plug in x values:

    y=1/-2-1=1/-3

    y=1/-1-1=1/-2

    y=1/0-1=1/-1=-1

    y=1/1-1=1/0=undefined (impossible)

    y=1/2-1=1/1=1

    y=1/3-1= 1/2

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  • 1 decade ago

    1. When x is a negative number, it will not be true.

    The square root of (-5)^2 = 5, not negative 5

    2. Substitute

    -1/3, undefined, -1,undefined (again), 1, 1/2

    I'm thinking you mean -1 for the second value. In that case it's -1/2

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  • 1 decade ago

    I can only help with question # 2

    x= -2; y=-1/3

    x= 1; y= 0

    x= 0; y= -1

    x= 2; y = 1

    x= 3; y= 1/2

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  • 1 decade ago

    1. No. sqrt (-3) squared is 3, not -3

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