Which statement best explains why the value of this expression is equal to −8 1/2y?

Evaluate cos2θ for cosθ = square root of 3/2

The diagram represents the polynomial 4x2 + 23x – 72. what is the factored form of 4x2 + 23x – 72? (4x + 8)(x – 9) (4x – 8)(x + 9) (4x + 9)(x – 8) (4x – 9)(x + 8)

Meee i honestly dont know what this question talking about