Question

Solve
X2 + 1 =0 by factorisation

Answer 1

Answer:

Since both terms are perfect squares, factor using the difference of squares formula, a2−b2=(a+b)(a−b) a 2 - b 2 = ( a + b ) ( a - b ) where a=x and b=1 . If any individual factor on the left side of the equation is equal to 0 , the entire expression will be equal to 0 . Set the first factor equal to 0 and solve.

Step-by-step explanation:

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Answer 2

Answer:

x=i,\:x=-i

Step-by-step explanation:

x^2+1-1=0-1      

x^2=-1

x=$\sqrt{-1}$, x=-$\sqrt{-1}$

x=i, :x=-i