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Lina20 [59]
4 years ago
9

Solve for u. 3(3u-5)=39 .Simplify your answer as much as possible.

Mathematics
2 answers:
nirvana33 [79]4 years ago
8 0

3(3u-5)=39

Mutiply the bracket by 3

(3)(3u)(3)(-5)= 39

9u-15=39

Move -15 to the other side

Sign changes from -15 to +15

9u-15+15= 39+15

9u= 54

Divide by 9

9u/9= 54/9

Cross out 9 and 9, divide by 9 and then becomes u.

u= 6

Answer: u= 6

MatroZZZ [7]4 years ago
4 0

Step-by-step explanation:

3(3u-5)=39

9u - 15 = 39

9u = 15 + 39

9u = 54

divide both by 9

u = 54/9

u = 6

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Which value of f makes 3f+5=32 a true statement?<br> a. f=6 <br> b. f=8 <br> c. f=9<br> d. f=12
DIA [1.3K]

We just need to solve the equation in order to find the value.

3f+5=32

So we subtract 5 from both sides of the euqation and get

3f=27

Now we divide by 3 on both sides and get

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So the answer is C.


Hope this helps!

6 0
3 years ago
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BaLLatris [955]

Answer:

The last equation x2 - 2x -4 = 0

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Step-by-step explanation:

If a quadratic function has roots 1 and 5

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Unless you meant.  -4 and 6  ?

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-------------------------

Or did you mean  x = 1 and x =4 ?...

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x^2 - 2x + 4 = 0 :  complete square:  (x -1)^2 + 3 = 0

0x^2 + 2x - 4 = 0,    2x - 4 = 0,  x = 2

x^2 - 2x - 4 = 0  becomes:   x^2 - 2x + 1 - 1 -4 = 0 ;  (x - 1)^2 - 5 = 0

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