Please solve and explain

label Algebra
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Please explain me with working

x^2 - 4 = 0

Nov 20th, 2014

here,
x^2-4 = 0
so, x^2 = 4

now we know 4 is square of 2 and -2
so we can write , x^2 = (+2)^2 or (-2)^2

so the answer is x = 2 or -2.

Hope it helps thanks :)

Nov 20th, 2014

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