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What should be added to the polynomial x2 – 5x + 4, so that 3 is the zero of the resulting polynomial?
Given;
p(x) = x2 – 5x + 4
3 is the zero of the resulting polynomial
So we have;
p(3) = (3)2 – 5×3 + 4
p(3) = 9 – 15 + 4
p(3) = – 2
As – 2 is the remainder,
So 2 should be added to the given polynomial to get 3 as the zero of the resulting polynomial.
We can also verify the answer;
By adding 2 to the given polynomial we get;
P(x) = x2 – 5x + 4 + 2
P(x) = x2 – 5x + 6
P(3) = 9 – 15 + 6
P(3) = 15 – 15
P(3) = 0
Hence prooved that 2 is the right answer to get 3 as the zero of resulting polynomial.