Unformatted text preview: to solve. TIP 2 : To avoid sign errors, we will identify a , b , and c before we apply the Quadratic Formula. Here, a = 2 , b = ± 7 , and c = ± 15 . x = ± b ± b 2 ± 4 ac 2 a = ± ± 7 ( ) ± ± 7 ( ) 2 ± 4 2 ( ) ± 15 ( ) 2 2 ( ) = 7 ± 49 + 120 4 = 7 ± 169 4 WARNING 5 : We must simplify the radical . (If we had obtained, say, 7 ± 2 4 , there would be no need to simplify.) = 7 ± 13 4...
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 Spring '09
 Quadratic Formula, Equations, Quadratic equation, Expression

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