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arlik [135]
4 years ago
9

The value of b is 7, then what is the value of the expression -3b^2+25=

Mathematics
1 answer:
padilas [110]4 years ago
8 0
The answer is -122
Exponents first and if b is 7 it would be 7 X 7 which equals 49 and then you multiply 49 with -3 which would be -147. Then you add 25 to -147 which is -122
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Solve the system of equations 4x+5y=-1 and -5x-8y=10 by combining the equations.
Nimfa-mama [501]

The solution of the equation are as follows:

x = 6 and y = -5

<h3 />

<h3>How to solve the system of equation?</h3>

4x + 5y = -1

-5x - 8y = 10

Therefore,

20x + 25y = -5

-20x - 32y = 40

-7y = 35

y = -5

Hence,

4x + 5(-5) = -1

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x = 24 / 4

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