Question 46424
{{{((-4x^3)(y^5)(-2x^4)(y^7))}}}   
{{{((-4x^3)(-2x^4)(y^5)(y^7))}}} [Rearrange like-terms together (same bases)]
{{{((8x^(3+4))(y^(5+7)))}}}[Multiply coefficients, add exponents]
{{{((8x^7)(y^11)))}}}  [Final answer]