23. Find the root of x2 - 4x - 8 = 0 by the
method of completing square. (CBSE 2015)
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Step-by-step explanation:
x^2 -4x -8= 0
→x^2 -4x = 8
→x^2 -2×x×2 +2^2 = 8 +4
→(x-2)^2 = 12
→x-2= √12 or , -√12
→x= √12+2 or , 2-√12
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