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  2. Daily Challenge Course Discussion
  3. M4 Algebra Tools
  4. Week 3
  5. Day 12

  • Ratios of Rectangles With Square Cut Out

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  • Writing Proportions; Definition of Root; Viete's Formulas

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  • Quadratics That Can't Be Factored

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  • Prof. Loh's Method of Solving Quadratics; Difference of Squares

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    debbieD

    @divinedolphin I'm sorry, you are right, Prof. Loh doesn't mention Viete's Formulas in our course, but he does mention it in this explanation video:

    https://www.youtube.com/watch?v=XKBX0r3J-9Y
     
    Screenshot from 2020-11-28 14-56-45.png
     
    I think I got a little confused about where Prof. Loh mentioned it originally. 🙂

    The spelling of his name varies; sometimes it's spelled as "Vieta," and sometimes it's spelled as "Viete," as shown in Prof. Loh's video.

    Screenshot from 2020-11-28 14-53-35.png

    🙂

  • Using the Average of the Roots

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    debbieD

    @divinedolphin Oh no! I'm so sorry! There was an error and the person who made the video was supposed to put the choice iv.) as positive "7/2". In the meantime, until we can fix this error, I've made both choices iv.) and v.) to be correct in the system.

    🙏 Thanks so much for letting us know; we will get this fixed asap!

  • Radical Roots

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  • Derivation of the Quadratic Formula for x² + bx + c = 0 Using Prof. Loh's Method

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    quacker88Q

    Hey @energizedpanda!

    Could you specify which problem you're talking about? The forum is telling me Day 12 Part 7 but I don't think that's the right one.

  • Derivation of the Quadratic Formula for x² + bx + c = 0 Using Prof. Loh's Method

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  • Derivation of the Quadratic Formula for x² + bx + c = 0 Using Prof. Loh's Method

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    debbieD

    @divinedolphin Oh no! You are totally right..... The video editor forgot to add the very crucial equation, \( x^2 + 16x + 19 = 0,\) in the question statement.

    🤦

    Oops! I'm so sorry for this!! Thank you so much for finding this mistake. We really appreciate your help a lot!

  • Real and Imaginary Solutions of a Quadratic

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  • divinedolphinD

    Your turn

    4