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sidneylww
22.10.2020 •
Mathematics
A sewing machine is usually $160 but is on sale for 55% off. What is the new price?
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Ответ:
88 dollars
Step-by-step explanation:
To make it easier, divide 160 by half (80) and find 5 percent of 160 which is 8. Math go brrr
Ответ:
.. (-3/2)² = 9/4 . . . . . . the number you need to add.
x² -3x +9/4 = (x -3/2)²
If the x² term has a coefficient other than 1, you need to factor that out first and deal with the remaining binomial. For example,
.. 2x² -6x = 2(x² -3x)
For this you would need to add 9/4 inside parentheses to get
.. 2(x² -3x +9/4) = 2(x -3/2)²
Of course, to keep the original value, you would need to subtract 2*(9/4) outside parentheses.
.. 2x² -6x = 2(x -3/2)² -9/2