Question

4. Solve the equation x2-4x-1=0​

Answer 1

Answer:

-2x

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Answer 2

Step-by-step explanation:

x² - 4x - 1 = 0

a = 1 , b = -4 , c = - 1

D = b² - 4ac

= 16 - 4 ( 1 ) (-1 )

D = 20,

√D = 2√5

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x = ( √D ± b ) / 2a

x = ( 2√5 + 4 ) / 2

x = √5 + 2

or

x = √5 - 2

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#abhi