Question

Find the roots of x2 - 4x - 8 = 0 by the method of completing square.

Answer 1

Answer:

Solution,

x2 - 4x - 8=0

x2 - (4-2)x - 8=0

x2 - 4x +2x - 8=0

x(x-4)+2(x-4)=0

(x+2) (x-4) = 0

We know that,

(x + 2) = 0

x =2

Now,

(x-4) =0

x=4

Hence,

X =2,3#

Step-by-step explanation:

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