f(x) = x^{2} + 6x + 8

x^2 + 6x + 8 = (x+3)^2 - 1 = (x+2)(x+4)

vertex (-3; -1)

x-intercepts: (-4; 0) - smaller x-value

and (-2; 0) - larger x-value

y-intercept: (0; 8).

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