Question 56475
2x squared y negative squared 
2x^2 * y^-2
:
Remember that neg exponents can be eliminated by using the reciprocal:    
2x^2 * {{{1/y^2}}}
if x=-5 and y=7
Substitute:
2(-5)^2 * {{{1/7^2}}}
:
2(25) * {{{1/49}}}
:
{{{50/49)}}}