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x^(2) = 169

x^(2) - 169 = 0

x^(2) - 13^(2) = 0

Factor

(x - 13)( x + 13) = 0

Hence x = 13 and -13.

Usually shown as x = +/- 13

When factoring squared terms , remeber two squared terms with a NEGATIVE(-) between will factor.

However, two squared terms with a positive (+) between them, does NOT factor.

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lenpollock

Lvl 17
3w ago

What else can I help you with?