x 2 - 9x 0
x 2 - 9x 0, 9x 2 - 9 a + b * x + 2a 2 + 5ab + 2b 2 0, x 2 + 9x + 18 0, x 2 9x 20 0 completing the square, if x 0 then sqrt 4x + sqrt 9x 2, x 2 - 9x + 20 0, x 4 + 5x 2 - 36 2x 2 + 9x - 5 0, x 2 + 9x + 20 0
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x 2 - 9x 0
9x 2 - 9 a + b * x + 2a 2 + 5ab + 2b 2 0
x 2 + 9x + 18 0
x 2 9x 20 0 completing the square
if x 0 then sqrt 4x + sqrt 9x 2
x 2 - 9x + 20 0
x 4 + 5x 2 - 36 2x 2 + 9x - 5 0
x 2 + 9x + 20 0
x 2 - 9x 0, 9x 2 - 9 a + b * x + 2a 2 + 5ab + 2b 2 0, x 2 + 9x + 18 0, x 2 9x 20 0 completing the square, if x 0 then sqrt 4x + sqrt 9x 2, x 2 - 9x + 20 0, x 4 + 5x 2 - 36 2x 2 + 9x - 5 0, x 2 + 9x + 20 0