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anonymous

  • one year ago

...Solve the following system of equations and show all work. y = 2x2 y = –3x −1

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  1. anonymous
    • one year ago
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    @radar

  2. anonymous
    • one year ago
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    please help... I Dont understand

  3. welshfella
    • one year ago
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    since both expressions in x are equal to y then they are equal to each other so 2x^2 = -3x - 1

  4. welshfella
    • one year ago
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    this is a quadratic so write it as 2x^2 + 3x + 1 = 0 can you solve this for x?

  5. anonymous
    • one year ago
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    what do i do with the 2x^2

  6. welshfella
    • one year ago
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    this will factor to the form (2x + a)(x + b) = 0 to find a and b you need to find 2 numbers a and b where ab = 1 and a + 2b = 3

  7. anonymous
    • one year ago
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    okay hold on while i figure this sorry im really bad at this

  8. anonymous
    • one year ago
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    i cant im coming up with things like 2x+ 3x+ 2

  9. anonymous
    • one year ago
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    and thats not right

  10. welshfella
    • one year ago
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    what 2 numbers multiplied together give + 1? - think of the obvious ones

  11. anonymous
    • one year ago
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    -1 and -1 1 and 1

  12. welshfella
    • one year ago
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    yes either of those but also a + 2b = 3 so which ones are they?

  13. welshfella
    • one year ago
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    plug in the -1 and -1 and then the 1 and 1 and see which of these fit

  14. anonymous
    • one year ago
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    for the negatives i got -3

  15. anonymous
    • one year ago
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    and the positive i got 2

  16. welshfella
    • one year ago
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    2 for the positive? try again

  17. welshfella
    • one year ago
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    you need it to be = 3

  18. anonymous
    • one year ago
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    yes now ive got it lol i must of did it wrong

  19. anonymous
    • one year ago
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    now that we have that info what do i do next

  20. welshfella
    • one year ago
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    you now have the values of a and b so we can factor the equation (2x + 1)(x + 1) = 0 now when 2 things are multiplied and the result is 0 then either one of these can be 0 so we have 2x + 1 = 0 or x + 1 = 0 so you can solve these 2 equations to give 2 values of x then using these values of x plug them into one of the original equations to give the corresponding values of y

  21. anonymous
    • one year ago
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    okay thank you .

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