Solve each equation, if possible. Write irrational numbers in simplest radical form. Describe the strategy you used to get your solution and tell why you chose that strategy.

Given is x^2 - 4 = 0 -> x^2 - 2^2 = 0 ( 4 = 2^2 )

what about answer 2???

1= answer

-> (x-2).(x+2) = 0 ( x^2 - a^2 = (x-a).(x+a) ) -> x-2 = 0 or x+2 = 0 -> x = 2 or x = -2

x=-0.177243....................is your final answer

what about 1??

> x = 2 or x = -2

is your answer..............x=+-2

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