Question

x patrat +y patrat=38
x+y=8
x-y=?

Answer 1

$x { }^{2} + y {}^{2} = 38 \\ (x + y) \times (x - y) = 38 \\ 8 \times (x - y) = 38 \\ x - y = 38 \div 8 \\ x - y = 4.7$