SOLUTION: Using the quadratic equation x2 - 4x - 5 = 0, perform the following tasks:
a) Solve by factoring.
b) Solve by completing the square
c) Solve by using the quadratic formula
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Quadratic Equations and Parabolas
-> SOLUTION: Using the quadratic equation x2 - 4x - 5 = 0, perform the following tasks:
a) Solve by factoring.
b) Solve by completing the square
c) Solve by using the quadratic formula
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Question 42871This question is from textbook College Algerbra
: Using the quadratic equation x2 - 4x - 5 = 0, perform the following tasks:
a) Solve by factoring.
b) Solve by completing the square
c) Solve by using the quadratic formula This question is from textbook College Algerbra
You can put this solution on YOUR website! a) From x^2 - 4x - 5 = 0, we have
(x - 5)(x + 1) = 0
x = 5 and x = -1
b) From x^2 - 4x - 5 = 0, we have
x^2 - 4x + 4 - 5 = 4
(x + 2)^2 - 5 = 4
(x + 2)^2 = 9
x + 2 = ± 3
x = 2 ± 3
x = 5, -1
c) From x^2 - 4x - 5 = 0, we have
x = (4 ± sqrt(16+20)) / 2
x = (4 ± sqrt(36)) / 2
x = (4 ± 6) / 2
x = 5, -1
