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2014-03-18T19:31:53-03:00
X² - 3² = 5x + 9
x²-5x=9+3²
2x-5x=9+9
3x=18
x=6
2 5 2
2014-03-18T19:32:25-03:00
(x-3)²=5x+9
2x-3= 5x + 9
-5x-2x= +9+3
-7x=12
x=12: -7
x= 12
     -7