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b. ( 3x + 5 )( x - 2 )
x1,2 = (-b + √b² - 4ac) / 2a
= (2 + √2² - 4.1-10) / 2
= (2 + √4 + 40)/ 2
= (2 + √ 44) / 2
= (2 + 2√11) / 2
= 1 + √11
Kalau yang A soalnya x² - 2x - 10 = (x - 5) (x + 2)
x = 5 atau x = -2
b. 3x² - x - 10 = (3x + 5) (x - 2)
x = - 5/3 atau x = 2