Решить это 1)х^2-64у^2= 2)-2x^3-28x^2-98x= 3)49m^2-n^2 = 3mn^2-21m^2n 4)81x^2-16 = 16-72x+81x^2

1.
x²-64y²=(x-8y)(x+8y)

2.
-2x³-28x²-98x=-2x(x²+14x+49)=-2x(x+7)²

3.
(49m²-n²)/(3mn²-21m²n)= [(7m-n)(7m+n)]/[3mn(n-m)]

4.
(81x²-16)/(16-72x+81x²) = [(9x-4)(9x+4)]/(4-9x)²