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Rewrite the following quadratic functions in intercept or factored form. show your work. y = 5x^2 + 10x

Having a hard time understanding this question (see attachment).

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.