Asked by timothy
solve by completing the square
x^2-3x=4
please show work
x^2-3x=4
please show work
Answers
Answered by
Steve
x^2 - 2(3/2)x = 4
x^2 - 2(3/2)x + (3/2)^2 = 4 + (3/2)^2
(x-3/2)^2 = 25/4
(x-3/2)^2 = (5/2)^2
x - 3/2 = ±5/2
x = 3/2 ± 5/2 = -1 or 4
x^2 - 2(3/2)x + (3/2)^2 = 4 + (3/2)^2
(x-3/2)^2 = 25/4
(x-3/2)^2 = (5/2)^2
x - 3/2 = ±5/2
x = 3/2 ± 5/2 = -1 or 4
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