Using the numbers 1 through 9 only one time what is the highest
1 answer:
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Subtract 13 from both sides:
Divide both sides by -5. Since this is a negative number, you have to invert the inequality sign:
Which means
Multiply both the numerator and denominator by , which is called the "conjugate" of
:
Why do we pick this number? Recall the difference of squares factorization:
Now replace and
. Then
So in your fraction, you end up with
Finally, just expand the product.