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The number of integral solutions of `x^2+9

Answer» `x^2+9< (x+3)^2`
`x^2+9`6x>0`
`x>0`
`x^2+9+6x<8x+25`
`x^2-2x-16<0`
`x=(2+-sqrt(4+64))/2`
`x=(2+-sqrt(17))/2`
`=1+-sqrt17`
`1-sqrt17 < x <1+sqrt17 `
`0 < x <1+sqrt17`
`0 < x < 5......`
`x= 1,2,3,4,5,`
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