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x = -5 --> a.(-5)² + 14.(-5) - 5 = 0
25a - 70 - 5 = 0
25a - 75 = 0
25a = 75
a = 3
x = b
3x² + 14x - 5 = 0
(3x - 1) (x + 5) = 0
3x - 1 = 0
3x = 1
x = 1/3
b = 1/3
2a² - 6ab + 9b = 2.(3²) - 6.3.(1/3) + 9.(1/3)
= 18 - 6 + 3
= 15
semoga membantu ya :)