6.Solve the quadratic equation by the square root property.

(8x+1)2=4

The solution set is ____.

(Simplify your answers. Type exactanswers, using radicals as needed. Use a comma to separate answers asneeded

7.Solve the quadratic equation by completing the square.

x2+8x=15

The solution set is _____.

(Type an integer or a simplified fraction. Use a comma to separate answers asneeded.)

8.Solve the equation using the quadratic formula.

x2+9x+18=0

The solution set is ____

(Simplify your answer. Type an exactanswer, using radicals and i as needed. Use integers or fractions for any numbers in the expression. Use a comma to separate answers asneeded.)

9.Solve the equation using the quadratic formula.

x212x+40=0

The solution set is ______

(Simplify your answer. Type an exactanswer, using radicals and i as needed. Use integers or fractions for any numbers in the expression. Use a comma to separate answers asneeded.)