Using algebra prove that the square of any odd number is always 1 more than a multiple of 8

I'll give brainliest if you answer right : )

The graph of h(x)= |x-10| +6 is shown. on which interval is this graph increasing

Find the directions in which the function increases and decreases most rapidly at upper p 0p0. then find the derivatives of the function in these directions. f(x,y)equals=x squared plus xy plus y squaredx2+xy+y2, upper p 0p0left parenthesis 1 comma negative 4 right parenthesis