# 1) solve by using the perfect squares method. x2 + 8x + 16 = 0 2) solve. x2 – 5x – 6 = 0 3) what value should be added to the expression to create a perfect square? x2 – 20x 4) solve. x2 + 8x – 8 = 0 5) solve: 2x2 + 12x = 0 6) solve each problem by using the quadratic formula. write solutions in simplest radical form. 2x2 – 2x – 1 = 0 7) calculate the discriminant. x2 – x + 2 = 0 8) calculate the discriminant and use it to determine how many real-number roots the equation has. 3x2 – 6x + 1 = 0 9) without drawing the graph of the equation, determine how many points the parabola has in common with the x-axis and whether its vertex lies above, on, or below the x-axis. y = 2x2 + x – 3 10) without drawing the graph of the equation, determine how many points the parabola has in common with the x-axis and whether its vertex lies above, on, or below the x-axis. y = x2 – 12x + 12

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