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anonymous

  • 5 years ago

solve the equation x^2=80x+81

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  1. anonymous
    • 5 years ago
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    (x-40)^2-1681=0 x=40+-41

  2. anonymous
    • 5 years ago
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    x^2 - 80x -81 = 0 Use the quadratic formula, also will work

  3. anonymous
    • 5 years ago
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    Three ways to solve a quadratic equations: 1. Factorisation 2. Quadratic formula 3. Completing the square

  4. anonymous
    • 5 years ago
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    x^2 -81x+1x-81=0 x(x-81)+1(x-81)=0 (x+1)(x-81)=0

  5. anonymous
    • 5 years ago
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    bnc262, two kinds of solution have been done, so i think it is fair for you to try the last method :)

  6. anonymous
    • 5 years ago
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    when my teacher did these similar problems she got 2 answers is there a reason why

  7. anonymous
    • 5 years ago
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    We also got two answers if you look above. When you solve a quadratic equation expression which is equal to zero, you're actually trying to find all values of x for which that expression is equal to zero. If you look at a graph plot for the equation you're solving, you'll find that, for quadratics, the curve will cut the x-axis anywhere from zero to two times. There are, then, either zero, one or two (real) solutions for x, depending on the nature of your quadratic.

  8. anonymous
    • 5 years ago
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    yes every quadratic equation have 2 answers

  9. anonymous
    • 5 years ago
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    Sorry wali, have to be careful. A quadratic equation also can have just one answer or no answer.

  10. anonymous
    • 5 years ago
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    o yes it con have

  11. anonymous
    • 5 years ago
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    when you say solve the equation, what do you want to solve for?

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spraguer (Moderator)
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