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x = 1
2x^5 - bx^4 + ax^2 - 7
2(1)^5 - b(1)^4 + a(1)^2 - 7 = 2
2 - b + a - 7 = 2
-b + a - 5 = 2
-b + a = 7
x - 2 = 0
x = 2
2(2)^5 - b(2)^4 + a(2)^2 - 7 = 61
2(32) - 16b + 4a - 7 = 61
64 - 16b + 4a - 7 = 61
4a - 16b = 4
4a - 16b = 4
a - 4b = 1
a - b = 7_-
-3b = -6
3b = 6
b = 2
a - b = 7
a - 2 = 7
a = 9
a = 9 dan b = 2