Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

miah

  • 3 years ago

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

  • This Question is Closed
  1. miah
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @RadEn

  2. waterineyes
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    You can start by: Dividing both the sides by 5..

  3. miah
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    5x^2-4=0

  4. RadEn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    x^2 - 4 = 0

  5. RadEn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    factorize by using the difference squares formula a^2 - b^2 = (a+b)(a-b)

  6. waterineyes
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    And you can use here : \[x^2 - a^2 = (x + a) (x - a)\]

  7. waterineyes
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Or if you don't wanna do this, then add 4 both the sides and then take square root both the sides.

  8. miah
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so,... whats the answer ?

  9. miah
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @RadEn

  10. miah
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    its not B

  11. miah
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @waterineyes

  12. waterineyes
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Who told you that answer is B?

  13. waterineyes
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    \(x^2 - 4 = 0\) Add 4 both the sides and tell me what did you get?

  14. RadEn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    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!

  15. miah
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I dont really have to do the rest because there isnt another -2 in the other choices.

  16. RadEn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    hehe, good tricky :)

  17. waterineyes
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    do for the rest is actually for your own knowledge and not for answer choices you are given with..

  18. RadEn
    • 3 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok, show to us how to solve of x - 2 = 0 ?

  19. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy