[tex]\displaystyle \frac{1}{x_2^2}+\frac{1}{x_1^2} = \frac{x_1^2+x_2^2}{(x_1x_2)^2} = \frac{(x_1+x_2)^2-2x_1x_2}{(x_1x_2)^2} = \frac{1+30}{15^2} = \frac{31}{225}[/tex]
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[tex]\displaystyle \frac{1}{x_2^2}+\frac{1}{x_1^2} = \frac{x_1^2+x_2^2}{(x_1x_2)^2} = \frac{(x_1+x_2)^2-2x_1x_2}{(x_1x_2)^2} = \frac{1+30}{15^2} = \frac{31}{225}[/tex]