anonymous
  • anonymous
solve the equation x^2=80x+81
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
(x-40)^2-1681=0 x=40+-41
anonymous
  • anonymous
x^2 - 80x -81 = 0 Use the quadratic formula, also will work
anonymous
  • anonymous
Three ways to solve a quadratic equations: 1. Factorisation 2. Quadratic formula 3. Completing the square

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anonymous
  • anonymous
x^2 -81x+1x-81=0 x(x-81)+1(x-81)=0 (x+1)(x-81)=0
anonymous
  • anonymous
bnc262, two kinds of solution have been done, so i think it is fair for you to try the last method :)
anonymous
  • anonymous
when my teacher did these similar problems she got 2 answers is there a reason why
anonymous
  • anonymous
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.
anonymous
  • anonymous
yes every quadratic equation have 2 answers
anonymous
  • anonymous
Sorry wali, have to be careful. A quadratic equation also can have just one answer or no answer.
anonymous
  • anonymous
o yes it con have
anonymous
  • anonymous
when you say solve the equation, what do you want to solve for?

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