anonymous
  • anonymous
please help I will fan and medal Part B: Solve 4x^2 + 8x − 5 = 0 by using an appropriate method. Show the steps of your work, and explain why you chose the method used.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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schrodinger
  • schrodinger
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anonymous
  • anonymous
@pooja195 @Hero
Hero
  • Hero
Step 1, let 8x = 10x - 2x
anonymous
  • anonymous
okay then how would you rewright it in the appropriate method

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Hero
  • Hero
In other words, replace 8x with 10x - 2x so that you have 4x^2 + 10x - 2x -5
anonymous
  • anonymous
okay I see so what method would I use to solve this appropriately
Hero
  • Hero
Basically, at this point you can factor by grouping. So I guess that's what you wanted to know right?
anonymous
  • anonymous
yeah and now would I factor by grouping with this problem
Hero
  • Hero
You take the expression 4x^2 + 10x - 2x -5 and do the following: 1. Factor the first two terms 2, Factor the last two terms 3. Factor out what is common to both factorizations. Let me know what you get afterwards.
anonymous
  • anonymous
2x? @Hero
anonymous
  • anonymous
(2x-1) (2x+5)
Hero
  • Hero
Congratulations, you did it!
anonymous
  • anonymous
thank you but my last question is why is this method the one to use
anonymous
  • anonymous
does my question make sense? @Hero
Hero
  • Hero
There are a few reasons why: 1. It's algorithmic, meaning it can work with any factorable quadratic expression. 2. It's an application of the distributive property. 3. It's a better method to learn and teach than the mental method.
anonymous
  • anonymous
thank you so much

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