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loris [4]
3 years ago
11

-4(1 -6b) - 5 ( 2b - 6)= 8b - 7b

Mathematics
2 answers:
Citrus2011 [14]3 years ago
5 0
The answer is b=-2  Hope that helps!!                           
aksik [14]3 years ago
4 0
-4(1-6b)-5(2b-6)=8b-7b

We move all terms to the left:

-4(1-6b)-5(2b-6)-(8b-7b)=0

We add all the numbers together, and all the variables

-4(-6b+1)-5(2b-6)-(+b)=0

We multiply parentheses

24b-10b-(+b)-4+30=0

We get rid of parentheses

24b-10b-b-4+30=0

We add all the numbers together, and all the variables

13b+26=0

We move all terms containing b to the left, all other terms to the right

13b=-26

b=-26/13

b=-2

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What is the distance between 120 and -130 on a number line?
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Find the coefficient of x^4 in the expansion of (1 + 2x + 3x^3)^10?
Lesechka [4]
(1+2x+3x^3)^{10}

The only possible configurations of terms that contribute to generating the x^4 term in the expansion are given by the multinomial theorem to be

\left(\dbinom{10}{6,4,0}(1)^6(2x)^4(3x^3)^0+\dbinom{10}{8,1,1}(1)^8(2x)^1(3x^3)^1\right)x^4

where

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Simplifying a bit gives a coefficient of

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16(5\times3\times2\times7)+6(10\times9)=3900
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3 years ago
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