Question

x^2=600^2+800^2
x^2=360000+680000
×^2=1000000

Answer 1

X^2=600^2+800^2x^2=360000+680000
×^2=1000000

$x= \sqrt{1000000}$

X = + - 1000 

Answer 2

$x^2=(6.10^2)^2+(8.10^2)^2\\x^2=36.10^4+64.10^4\\x^2=100.10^4\\\boxed{x=\sqrt{100.10^4}=10.10^2=10^3}\\\\x^2=36.10^4+68.10^4\\x^2=104.10^4\\\\\boxed{x=\sqrt{104.10^4}\approx10,1.10^2=101.10^{-1}.10^2=1010}\\\\x^2=10^6\\\\\boxed{x=\sqrt{10^6}=10^3}$