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14. Solve each equation by any method of your choice. (6 points)



b. x^2+3x-28=0

c. 6x^2+11x-35=0

d. 5x^2-180=0

e. x^2-5x=2=0

f. 3x^2+5x-12=0


1 pt

State three terms that mean "solution" for quadratic equations.

16. Explain how you can use the graph of the quadratic function f(x) to solve the equation f(x) = 0.

17. Write the formula for the discriminant.

18. State the types of roots for a quadratic equation, explaining how the discriminant helps you determine the type. (2 points)

If. . .

If. . .

If. . .

If. . .

If. . .

19. Define the imaginary unit, i.

20. Write the standard form of a complex number, giving two examples. (1 point)

1 pt

21. Evaluate the discriminant for each equation, then use it to determine the nature of the roots for each quadratic equations. (3 points)

a. x^2+4x+5=0

b. x^2-4x-5=0

c. 4x^2+20x+25=0

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