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anonymous

  • one year ago

Solve each quadratic equation. Show your work Where do i start? 4x^2 = 100

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  1. welshfella
    • one year ago
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    divide both sides by 4 to isolate x^2:- x^2 = 25 can you continue?

  2. anonymous
    • one year ago
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    that will give the answer right

  3. welshfella
    • one year ago
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    well you need to find the value of x x ^2 means x times x so you need to think of a number which when multiplied by itself gives 25 ?

  4. anonymous
    • one year ago
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    Okay. 4x^2/4 100/4 = 25

  5. anonymous
    • one year ago
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    Does that get rid of the x^2?

  6. anonymous
    • one year ago
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    the work shown should help get the solution which i think is 25

  7. anonymous
    • one year ago
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    Yeah 100/4=25

  8. anonymous
    • one year ago
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    Do i have x^2 any more or does it go with the 4 @welshfella ?

  9. welshfella
    • one year ago
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    no 25 is not the solution we have x^2 = 25 so x = ?

  10. anonymous
    • one year ago
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    so 25 is the answer

  11. anonymous
    • one year ago
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    25x^2?

  12. anonymous
    • one year ago
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    100 is the solution

  13. anonymous
    • one year ago
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    x=4

  14. welshfella
    • one year ago
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    no the solution is the value of x we know that x times x = 25 so what must x be?

  15. welshfella
    • one year ago
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    Not 4 because 4*4 = 16 not 25

  16. anonymous
    • one year ago
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    what do you think

  17. anonymous
    • one year ago
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    How do we find the value of x?

  18. welshfella
    • one year ago
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    x is the square root of 25 that is the number that when multiplied by itself gives 25 for example 3 is square root of 9 as 3 * 3 = 9

  19. anonymous
    • one year ago
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    hold on let me try to figure this out

  20. welshfella
    • one year ago
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    what times what = 25?

  21. anonymous
    • one year ago
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    so you would use square root

  22. welshfella
    • one year ago
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    yea

  23. anonymous
    • one year ago
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    okay

  24. anonymous
    • one year ago
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    625?

  25. anonymous
    • one year ago
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    i think so

  26. welshfella
    • one year ago
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    no - thats the SQUARE of 25 25*25 = 625

  27. anonymous
    • one year ago
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    okay what do you think

  28. welshfella
    • one year ago
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    5 *1 = 5 5*2 = 10 5*3 = 15 5*4 = 20 what comes next?

  29. welshfella
    • one year ago
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    now you have it

  30. anonymous
    • one year ago
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    25

  31. anonymous
    • one year ago
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    sooooo

  32. welshfella
    • one year ago
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    5 is the square root of 25 because 5 * 5 = 25 x^2 = 25 so x = 5

  33. anonymous
    • one year ago
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    Alright

  34. welshfella
    • one year ago
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    actually there is 2 answers 5 and -5 because -5*-5 is also equal to 25

  35. anonymous
    • one year ago
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    okay was i right

  36. anonymous
    • one year ago
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    Neat. Thanks for helping me i appreciate it :)

  37. welshfella
    • one year ago
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    @kitty_lover1234 No . 25 is not the answer

  38. anonymous
    • one year ago
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    what do you think it is

  39. anonymous
    • one year ago
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    x=5

  40. anonymous
    • one year ago
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    okay

  41. welshfella
    • one year ago
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    also -5 write the answer as {5,-5}

  42. anonymous
    • one year ago
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    Alright

  43. welshfella
    • one year ago
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    that is what is known as the 'solution set'. Written in curly brackets.

  44. anonymous
    • one year ago
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    i see where i went wrong

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