Execute the indicated operation on the given expression. (x²-49)/(x+1)² ⋅ (x²+8x+7)/(2x²-15x+7)÷(x+7)²/(2x²+x-1)

In the given rational expression, write all the numbers that make this expression undefined. Then simplify.

(x-1)/(x²-1)

Simplify the given algebraic expression: (x-5)(x+1) -(2x-3)(3x+1)

Determine the product of the given expression (xy³ +3)(1- x²y)