painto4mL6exis
painto4mL6exis painto4mL6exis
  • 17-09-2016
  • Mathematics
contestada

the square of 9 more than a number is equal to 9 more than the square of the number. what is the number?

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cmar32
cmar32 cmar32
  • 18-09-2016
(x+9)^2 = x^2 +9
x^2 +18x + 81 = x^2 +9
18x = -72
 x = -4
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