anonymous
  • anonymous
Solve the equation by graphing: x^2 – 18x + 81 = 0. A. {-2, 9} B. {9/2, 3} C. {9} D. No solution
Mathematics
schrodinger
  • schrodinger
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amistre64
  • amistre64
since you have options, why not just plug and play?
amistre64
  • amistre64
1 -18 81 0 -2 1 -20... -2 not a zero
anonymous
  • anonymous
If you have to graph, I would convert the equation into vertex form.

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amistre64
  • amistre64
1 -18 81 0 9 -81 1 -9 .... 9 IS a zero
amistre64
  • amistre64
and; 18/2 = 9, ^2 = 81 so its a perfect square already
amistre64
  • amistre64
id go 9 :)
anonymous
  • anonymous
If you are asked to graph - then you need to know how to graph. Do you understand how to graph the equation?
anonymous
  • anonymous
ya the answer is 9 guys
anonymous
  • anonymous
Make a T-chart |dw:1327882261999:dw| keep on going till you get a y value of 9. You will notice the trend of lowering y values.

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