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Mungkin seperti itu jawabnya
1/2(2x² - 5x - 4) = 0(1/2)
x² - 5/2x - 2 = 0
x² - 5/2x = 2
(x - 5/4)² - 25/16 = 2
(x - 5/4)² = 2 + 25/16
(x - 5/4)² = 32/16 + 25/16
(x - 5/4)² = 57/16
x - 5/4 = + √57/16
x = 5/4 + √57/16
Jadi, a = 5/4 + √57/16 dan b = 5/4 - √57/16
maka, ab :
(5/4 + √57/16)(5/4 - √57/16)
= (5/4)² - (√57/16)²
= 25/16 - 57/16
= -32/16
= -2