## Prealgebra (7th Edition)

$9^2+x^2=14^2$ $81+x^2=196$ $x^2=196-81$ $x=\sqrt {115}$ $\sqrt {115}\approx10$ Divide and find the average to find the approximate solution. $115\div10=11.5$ $(10+11.5)\div2=10.8$ Repeat to further refine, $115\div10.8=10.6$ $(10.8+10.6)2=10.7$