Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

y=(-x^4)/8 + (x^2)/2 - 1/2. Find the x-intercept.?

The answer from Desmos and the back of the worksheet, is 2^(1/2) and -(2^(1/2)), but I keep getting something entirely different. Please help me!

Update:

Please excuse the grammar error, I am perfectly aware of it.

1 Answer

Relevance
  • jet l
    Lv 5
    7 years ago
    Favorite Answer

    since y = 0

    let z be x^2

    -z^2/8+z/2-1/2=0

    if we multiply everything by 8

    -z^2+4z-4=0

    by quadratic formula

    z=2

    since z = x^2 = 2

    x^2=2

    x= +/- 2^(1/2)

    which is your answer

Still have questions? Get your answers by asking now.