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anonymous

  • one year ago

help solving quadratic equation 8x+60=x^2+15x Help please please cx

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  1. Nnesha
    • one year ago
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    set it equal to 0 so move 8x+60 to the right side

  2. anonymous
    • one year ago
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    so 0=x^2+15x- 8x+60?

  3. Nnesha
    • one year ago
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    nope 60 is positive at left side so subtract 60 both sides

  4. anonymous
    • one year ago
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    ohhh so 0=x^2+15x- 8x-60?

  5. Nnesha
    • one year ago
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    yes right now combine LIKE terms

  6. anonymous
    • one year ago
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    0=x^2+15x- 8x-60 ^ 7 0=x^2+7x-60

  7. anonymous
    • one year ago
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    @Nnesha what do i do next?

  8. Nnesha
    • one year ago
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    yes that's right now you can use quadratic formula to solve for x \[\huge\rm \frac{ {- }b \pm \sqrt{b^2 -4ac} }{ {2a} }\] or you can factor it \[ \large\rm \color{red}{1}x^2 +\color{Red}{ 7}x \color{reD}{- 60} = 0\]\[\large\rm \color{blue}{A}x^2 +\color{blue}{B}x+\color{blue}{C}=0\]

  9. anonymous
    • one year ago
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    the factoring one seems simpler lol

  10. anonymous
    • one year ago
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    i think thats what im suppose to do, is to factor it

  11. Nnesha
    • one year ago
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    alright to factor this one find two number if you multiply them you should get product of AC and if you add or subtract them you should get middle term b

  12. Nnesha
    • one year ago
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    A is leading coefficient C is constant term :-)

  13. anonymous
    • one year ago
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    -5 and 12

  14. Nnesha
    • one year ago
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    yep right so bec leading coefficient is just one GREAT! just write those two numbers with x (x + 1st number)(x+ 2nd number)

  15. anonymous
    • one year ago
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    (x+(-5))(x+12)

  16. Nnesha
    • one year ago
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    yes right + times -5 equal - so (x-5)(x+12)=0

  17. Nnesha
    • one year ago
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    if you have to solve for x set both parentheses equal to zero solve for x like this x-5 =0 and x+12 =0

  18. anonymous
    • one year ago
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    ohh ok, i would get 5 and -12

  19. Nnesha
    • one year ago
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    yep that's right!

  20. anonymous
    • one year ago
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    Thank you!, is that it?

  21. anonymous
    • one year ago
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    the answer

  22. Nnesha
    • one year ago
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    yep factors are (x-5)(x+12) solution or x value are 5 and -12

  23. anonymous
    • one year ago
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    Thank you so much! Cx

  24. Nnesha
    • one year ago
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    my pleasure :-)

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