Sum
Solve : x² – 16 = 0
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Solution
`x^2 - 16 = 0`
`=> x^2 - 4^2 = 0`
`=> (x + 4)(x - 4) = 0`
Since x + 4 = 0 or x - 4 = 0
then x = -4 or x = 4
Concept: Quadratic Equations
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