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goblinko [34]
3 years ago
10

Can someone help me? (2x+8)-(2x+16)

Mathematics
2 answers:
a_sh-v [17]3 years ago
8 0

Answer:

-8

Step-by-step explanation:

White raven [17]3 years ago
7 0

Answer:

-8

Step-by-step explanation:

(2x+8)-(2x+16)

Distribute the minus sign

(2x+8)-2x-16

Combine like terms

2x-2x  +8-16

0x -8

-8

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Answer:

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3 0
3 years ago
The GCD(a, b) = 9, the LCM(a, b)=378. Find the least possible value of a+b.
denis-greek [22]
\mathrm{gcd}(a,b)=9\implies9\mid a\text{ and }9\mid b\implies9\mid a+b

which means there is some integer k for which a+b=9k.


Because 9\mid a and 9\mid b, there are integers n_1,n_2 such that a=9n_1 and b=9n_2, and


\mathrm{lcm}(a,b)=\mathrm{lcm}(9n_1,9n_2)=9\mathrm{lcm}(n_1,n_2)=378\implies\mathrm{lcm}(n_1,n_2)=42

We have 42=2\cdot3\cdot7, which means there are four possible choices of n_1,n_2:

1, 42
2, 21
3, 14
6, 7

which is to say there are also four corresponding choices for a,b:

9, 378
18, 189
27, 126
54, 63

whose sums are:

387
207
153
117

So the least possible value of a+b is 117.
6 0
4 years ago
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