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jambunny26
24.08.2019 •
Mathematics
What multiplies to equal negative 90 but adds to be negative one
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Ответ:
Or, you could set up and solve two equations:
x + y = 1
xy = -90
Solve the first for x,
x = 1 - y
Substitute into the second,
(1 - y)y = -90
y - y² = -90
y² - y - 90 = 0
Factor
(y - 10)(y + 9) = 0
The roots are 10 and -9
If y = 10, then x = 1 - y = -9
We know that pair works.
If y = -9, then x = 1 - y = 10
That pair works, also.
Ответ:
4 rectangles are inside the rectangle the other ones are squares
Step-by-step explanation: