SOLUTION: There are Four different methods of solving a quadratic equation; factoring, the square root property, completing the square, and the quadratic formula. Explain under what circumst

Question 451965: There are Four different methods of solving a quadratic equation; factoring, the square root property, completing the square, and the quadratic formula. Explain under what circumstances each method would be preferred over any of the other methods. Give an example for each circumstance.
Answer by richard1234(7193) (Show Source): You can put this solution on YOUR website!
Factoring is a somewhat difficult method when it comes to quadratic equations, since you have to find all factors of the coefficients and see if they work. It does work on problems such as x^2 + 19x + 84 = 0, since 84 = 12*7 and 12+7 = 19. However, in some instances, factoring might already "assume" you know the zeros of the quadratic.

The square root property only applies to x^2 = c --> x = +/- sqrt(c). For example, if the quadratic is x^2 = 9, then x = 3 or -3.

You can complete the square anytime, as long as you are good with arithmetic. The quadratic equation x^2 + 8x + 3 = 0 can be turned into a square by adding 13 to both sides, i.e. x^2 + 8x + 16 = 13 --> (x+4)^2 = 13, then take the +/- square root of both sides.

The quadratic formula always works for a quadratic. Use this if the other methods fail, or if you do not wish to factor or complete the square.
RELATED QUESTIONS
Four different methods of solving a quadratic equation have been discussed in this... (answered by lwsshak3)

find positive square root of equation 4x^2+ 7x = 15 complete square Solving a... (answered by stanbon,josmiceli,Alan3354)

When you look at a quadratic equation, how do you know which method to use to solve it.... (answered by Alan3354)

What is the solution for this? Please use the 4 methods in quadratic equation to see the (answered by rothauserc)

Of the four primary methods Factoring, Square Roots, Completing the Squares, and The... (answered by solver91311)

What is the solution for this? Please use the 4 methods in quadratic equation to see the (answered by josgarithmetic,richwmiller)

quadratic equations have methods of solving help me to solve by completing the square (answered by bella18)

Solve by whatever method seems easiest, quadratic, factoring, property of square, of... (answered by scott8148)