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7-9.

Consider the function y = x2 + 5x + 7. Homework Help ✎

  1. Complete the square to find the vertex.

  2. Find the y-intercept.

Use the vertex, the y-intercept, and the symmetry of parabolas to find a third point and sketch the graph.

Add and subtract   on the same side of the equal sign.

Simplify.

Simplify more.

Substitute 0 for x to find the y-intercept.