in the following find whether the given quadratic equation have real roots and if so find the roots
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★ QUADRATIC RESOLUTION ★
GIVEN EQUATION :
9x² - 9( a+b)x + (2a² + 5ab + 2b² ) = 0
BY QUADRATIC FORMULA -
9 ( a + b ) ± √ 81(a+b)² - 4 (9)( 2a² + 5ab + 2b² ) / 2( 9 )
RESOLVING " D " SEPARATELY :
81 ( a + b ) ² - 4 ( 9 )( 2a²+5ab+2b² )
81( a² + b² + 2ab ) - 36( 2a²+5ab+2b² )
81a²+81b²+ 162ab - 72a²- 180ab - 72b²
9a² + 9b² -18ab = [3(a+b)]²
D = [3(a+b)]² ; √D = 3( a+b )
9( a+b ) ± 3 ( a + b ) / 18
yields two values or roots respectively ,
2/3 ( a + b ) ; a+b /3
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