tonya021773p8xw33 tonya021773p8xw33

07-06-2018
Mathematics

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using a quadratic formula to find the zeros of the function round to Tenth if necessary y equals x squared - 21

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jcherry99 jcherry99

07-06-2018

y = x^2 - 21
The roots occur when y = 0
x^2 - 21 = 0 Add 21 to both sides.
x^2 = 21 Take the square root of both sides.
sqrt(x^2) = sqrt(21)
x = +/- 4.583

I've enclosed a graph to make sure that you can see what the answer means.

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