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Unformatted text preview:18 x = 20.89 18 x = − 6.89 18 x = 1.16 x = -0.38 3.Solve 9 x 2 - 11 x +15 = 10 Solutions x = 11 ±i√ 59 18 x =− (− 11)± √ (− 11)2 − 4( 9 ) ( 5 ) 2 ( 9 ) x= 11 ±√ ( 121 ) − 4 (9) ( 5 )2 ( 9 )x =11 ± √ − 59 FORMTEXT FORMTEXT 18 x = 11± √− 5918x = 11±i√ 5918 4. Solve 7 x 2 +10 x + 5 = -3Solutions x= − 5 ±i √ 31 7x =− ( 10 ) ± √ ( 10 ) 2− 4 ( 7 ) ( 8 ) 2 ( 7 ) x = − 10 ± √ (100) − 4 ( 7 ) ( 8 ) 2 ( 7 )x = − 10 ± √− 124 FORMTEXT FORMTEXT14 x = − 10 ± √−( 4)(31 ) 14 x = − 10± 2 i √ 3114x = − 5 ±i √31 7