JaySavage7001
10.02.2020 •
Mathematics
Solve x²-4x-1=0 in the form a+-square root b
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Ответ:
x = 2 ±
Step-by-step explanation:
Given
x² - 4x - 1 = 0 ( add 1 to both sides )
x² - 4x = 1
Using the method of completing the square
Add ( half the coefficient of the x- term )² to both sides
x² + 2(- 2) x + 4 = 1 + 4
(x - 2)² = 5 ( take the square root of both sides )
x - 2 = ± ( add 2 to both sides )
x = 2 ±
Ответ:
is this the full answer?