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Which graph corresponds to the function f(x) = x2 + 4x – 1?

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.