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miah Group Title

Solve. 5x2 – 20 = 0 x = 5 and x = 4 x = 4 and x = 2 x = –5 and x = 20 x = 2 and x = –2

  • one year ago
  • one year ago

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  1. miah Group Title
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    @RadEn

    • one year ago
  2. waterineyes Group Title
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    You can start by: Dividing both the sides by 5..

    • one year ago
  3. miah Group Title
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    5x^2-4=0

    • one year ago
  4. RadEn Group Title
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    x^2 - 4 = 0

    • one year ago
  5. RadEn Group Title
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    factorize by using the difference squares formula a^2 - b^2 = (a+b)(a-b)

    • one year ago
  6. waterineyes Group Title
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    And you can use here : \[x^2 - a^2 = (x + a) (x - a)\]

    • one year ago
  7. waterineyes Group Title
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    Or if you don't wanna do this, then add 4 both the sides and then take square root both the sides.

    • one year ago
  8. miah Group Title
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    so,... whats the answer ?

    • one year ago
  9. miah Group Title
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    @RadEn

    • one year ago
  10. miah Group Title
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    its not B

    • one year ago
  11. miah Group Title
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    @waterineyes

    • one year ago
  12. waterineyes Group Title
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    Who told you that answer is B?

    • one year ago
  13. waterineyes Group Title
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    \(x^2 - 4 = 0\) Add 4 both the sides and tell me what did you get?

    • one year ago
  14. RadEn Group Title
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    well, look at how the factorization works x^2 - 4 = 0 x^2 - 2^2 = 0 use the diff square formula, (x+2)(x-2) = 0 solve for x find the zeroes by make each factor be zero first, x+2=0 subtract by 2 from both sides, x+2-2 = 0-2 x = -2 do for the rest!

    • one year ago
  15. miah Group Title
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    I dont really have to do the rest because there isnt another -2 in the other choices.

    • one year ago
  16. RadEn Group Title
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    hehe, good tricky :)

    • one year ago
  17. waterineyes Group Title
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    do for the rest is actually for your own knowledge and not for answer choices you are given with..

    • one year ago
  18. RadEn Group Title
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    ok, show to us how to solve of x - 2 = 0 ?

    • one year ago
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