Discuss the signs of the following quadratic expression when x is real
(I) x2-5x+4
(ii) x2-x+3
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Answer:
(I) x^2-5x+4
(ii)x^2-x+3
Step-by-step explanation:
(I) By factorisation method,
=x^2-4x-x+4
=x(x-4)-1(x-4)
=(x-1)(x-4)
Therefore, x=1 or x=4.
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