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Gemiola [76]
3 years ago
9

What is the simplest form of this expression -x(7x+2)+x^2

Mathematics
2 answers:
kodGreya [7K]3 years ago
7 0
 The answer would be  -6x ^ 2 - 2x
Equation:
=-x (7x + 2) + x ^ 2
 =(-7x ^ 2 -2x) + x ^ 2
Add similar terms,
 -6x ^ 2 - 2x

 
The simplified expression is given by:
 
-6x ^ 2 - 2x
STALIN [3.7K]3 years ago
5 0
For this case we have the following expression:
 -x (7x + 2) + x ^ 2
 Rewriting we have:
 (-7x ^ 2 -2x) + x ^ 2
 Adding similar terms we have:
 -6x ^ 2 - 2x
 Answer:
 
The simplified expression is given by:
 
-6x ^ 2 - 2x
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L 5.2.3 Quiz: Two-Variable Systems: Substitution
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Answer:

We get x=3 and y=21

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For substitution method we substitute the value of x or y from one equation to other.

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y = 10x-9--eq(1)\\y = x + 18--eq(2)

Putting value of y from equation 2 into equation 1

y=10x-9\\Put\:y=x+18\\x+18=10x-9\\x-10x=-9-18\\-9x=-27\\x=\frac{-27}{-9}\\x=3

So, we get value of x=3

Now, for finding value of y, We substitute the value of x

Find value of x from equation 2

y=x+18\\x=y-18

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y=10x-9\\Put\:x=y-18\\y=10(y-18)-9\\y=10y-180-9\\y-10y=-189\\-9y=-189\\y=\frac{-189}{-9}\\y=21

So, we get value of y=21

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