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a)
W(1) = 5
2 * 1³ - 4 * 1² + 5 * 1 + a = 5
2 - 4 + 5 + a = 5
a + 3 = 5
a = 5 - 3
a = 2
b)
W(2) = 3
2 * 2³ - 4 * 2² + 5 * 2 + a = 3
16 - 16 + 10 + a = 3
a + 10 = 3
a = 3 - 10
a = -7
W(1)=2-4+5+a=5
3+a=5
a=5-3
a=2
b)
W(2)=2*2³-4*2²+5*2+a=3
16-16+10+a=3
a=3-10
a=-7