algebra

can someone show line by line step by step
factor
x^2-15

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  1. a ^ 2 - b ^ 2 = ( a + b ) ( a - b )

    x ^ 2 + [ sqrt ( 15 ) ] ^ 2 =

    [ x + sqrt ( 15 ) ] * [ x - sqrt ( 15 ) ]

    sqrt mean "square root"

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