ntrann22
04.06.2020 •
Mathematics
Find the solutions to the system of equations algebraically.
x2 + y2 = 25
y = -2x + 5
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Ответ:
x = 0 or x = 4
Step-by-step explanation:
x² + y² = 25 and y = -2x + 5
Here,
x² + y² = 25 ...(1)
Now,
Put the value of y = -2x + 5 in equation (1)
we get,
x² + (-2x + 5)² = 25
x² + {(-2x)² + 2(-2x) (5) + (5)²} = 25
x² + {4x² - 20x + 25} = 25
x² + 4x² - 20x + 25 = 25
5x² - 20x = 25 - 25
5x² - 20x = 0
5x(x - 4) = 0
5x = 0 or x - 4 = 0
x = 0/5 or x = 4
x = 0 or x = 4
Ответ:
3000 N
Step-by-step explanation:
The work done by a force on an object is given as the product of the force applied on the object and the distance moved by the object.
Mathematically:
W = F * d
The force applied by the man is 150 N and the distance moved is 20 m. Hence, the work done by the man is:
W = 150 * 20 = 3000 J
The work done by the man is 3000 Joules.