DeadpoolDude152
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A class is trying to eliminate t from the parametric equations x=t^2+3 and y=4t. Beth says that she can write t=sqrt(x-3) to eliminate the parameter. Why is this wrong?

She should have added 3 to x, not subtracted.
She should always solve for t as a function of y.
She should have taken both the positive and negative square root.
She should first substitute y for t before solving.

Respuesta :

popalabdulqayou
C, She should have taken both the positive and negative square roots,

Because when a number is squared, even if it is negative it can become positive,

so taking square should include + and - to the answer.

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