Eduardo solved the following inequality, and his work is shown below:
−5(x + 4) + 21 ≥ −3 + 4(x − 8)
−5x − 20 + 21 ≥ −3 + 4x − 32
−5x + 1 ≥ 4x − 35
−9x ≥ −36
x ≥ 4
What mistake did Eduardo make in solving the inequality?
Stacey Warren - Expert brainly.com
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I cant find it
Eduardo made one simple mistake with the answer and a lot of us do it. xD
Anyway did you know that when you divide a number by a negative number, the inequality sign changes direction?
So, this > would become <.
Or, this ≥ would become ≤.
Eduardo divided -36 by -9. 9 is negative so we have to change the sign.
Therefore, his answer should have been: x ≤ 4, as opposed to x ≥ 4.
Does that make sense? (: