What is the solution(s) to the equation 5a^2 - 44 = 81

Answer these questions showing your work plz

Evaluate the expression for the given value of the variable 7a - 4a for a =8

Plz determine whether the polynomial is a difference of squares and if it is, factor it. y2 – 196 is a difference of squares: (y + 14)2 is a difference of squares: (y – 14)2 is a difference of squares: (y + 14)(y – 14) is not a difference of squares