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13.11.2019 •
Mathematics
5x=+y=7
20x+2=y
solve this system of equations without graphing and show your reasoning:
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Ответ:
Multiply the first, outside, inside, and last terms of the binomials.
Multiply a times a, a times -b, b times a, and b times -b.
This is the same as just squaring a and squaring b.
A shortcut is to add a squared and b squared.