Is (x - 2) a factor of P(x) = x3 + 2x2 - 6x - 4?

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

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What is the missing statement in step 4? ? rts ? ? vtu and ? rtu ? ? vts ? rts ? ? rvs and ? rtu ? ? stv ? vrs ? ? vru and ? usr ? ? usv ? vur ? ? vus and ? uvs ? ? sru