Posted by **Krissy** on Monday, January 21, 2013 at 5:26pm.

The expression x^2-7 is not factorable using integer values. But the expression can be written in the form X^2-(Square root7)^2 enabling us to factor it as a “binomial” and its conjugate: (x+square root 7)(x-square root 7) Use this idea to factor the following expressions.

1. X^2-5

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