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5x² + 2x + 7 = 0
( 5x +7 )( x - 1 ) = 0
Berarti x = -7/5 atau x = 1
2. 2x² - 4x = 5x + 6
2x² - 4x - 5x - 6 = 0
2x² - 9x - 6 = 0
Pakai rumus ∆ABC yaitu,
Persamaan ax² + bx + c = 0 mempunyai solusi x yaitu :
x = - b ± √ b² - 4ac / 2a
Maka, x = 9 ± √ 129 / 4
3. x² - 6x + 27 = 0
x = 6 ± √ - 108 / 2
Tidak mempunyai solusi real.