Question

If x=-3 is (x-5)(x-7)<0?​

Answer 1

Answer: False

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Replace every x with -3. Then simplify the left side.

(x-5)(x-7) < 0

(-3-5)(-3-7) < 0

(-8)*(-10) < 0

80 < 0 ... this statement is false, 80 is not smaller than 0

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(x-5)(x-7) < 0 is false when x = -3