Question

Discuss the signs of the following quadratic expressions when x is real in.
i) x²- 5x + 4
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Answer 1

Step-by-step explanation:

x ^2 −5x+4

=x ^ 2 −4x−x+4

=x(x−4)−1(x−4)

=(x−4)(x−1)

∴x ^2−5x+4 = (x−4)(x−1)