The roots of the equation \( (a+\sqrt{b})^{x^{2}-15}+(a-\sqrt{b})^{x^{2}-15}=2 a \) where \( a^{....
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0The roots of the equation
\( \mathrm{P} \)
\( (a+\sqrt{b})^{x^{2}-15}+(a-\sqrt{b})^{x^{2}-15}=2 a \) where \( a^{2}-b=1 \),
W
are
(1) \( \pm 3 \)
(2) \( \pm 4 \)
(3) \( \pm \sqrt{14} \)
(4) \( \pm \sqrt{5} \)
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