Question

please solve this in rough work Class 8​

Answer 1

Answer:

$\dfrac{xx}{\sqrt{225}}=1\quad :\quad x=\sqrt{15},\:x=-\sqrt{15}\quad \left(\mathrm{Decimal}:\quad x=3.87298\dots ,\:x=-3.87298\dots \right)$

Step-by-step explanation:

$\dfrac{xx}{\sqrt{225}}=1$

$\mathrm{Simplify}$

$\dfrac{x^2}{15}=1$

$\mathrm{Multiply\:both\:sides\:by\:}15$

$\dfrac{15x^2}{15}=1\cdot \:15$

$x^2=15$

$\mathrm{For\:}x^2=f\left(a\right)\mathrm{\:the\:solutions\:are\:}x=\sqrt{f\left(a\right)},\:\:-\sqrt{f\left(a\right)}$

$x=\sqrt{15},\:x=-\sqrt{15}$