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Elodia [21]
2 years ago
5

Find the sum of 5(-3.4k -7) + (3k +12) and please show work

Mathematics
1 answer:
pishuonlain [190]2 years ago
5 0
5(-3.4k-7)+(3k+12)=\ \ \ \ | omiting\ brackets\\\\
-17k-35+3k+12=\\\\
-14k-23\\\\
Solution\ is\ -14k-23
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Solve 2x3 + x2 - 15x completely by factoring.
KatRina [158]
Answer:
The solutions are 0 , 5/2 and -3

Explanation:
The given expression is:
2x³ + x² - 15x
We can note that we can take x as a common factor from all terms. This will give us:
x(2x²+x-15)

Now, the expression 2x² + x - 15 is a second degree polynomial that can be factored using the quadratic formula shown in the attached image.
In the given expression:
a = 2
b = 1
c = -15
Substituting with the values of a, b and c in the formula, we would find that
2x² + x - 15 can be factored as (2x-5)(x+3)

Based on the above, the factored form of the given expression is:
x(2x-5)(x+3)

Now, to find the solutions means to find the values of x that would make the expression equal to zero.
This means that:
x(2x-5)(x+3) = 0
either x = 0
or 2x-5=0 .............> 2x = 5 ...........> x = 5/2
or x+3=0 ............> x = -3

Based on the above, the solutions of the system are:
0 , 5/2 and -3

Hope this helps :)

5 0
3 years ago
Read 2 more answers
Directions: Simplify each expression by distributing <br> 1. 8(x + 5) =<br> 3.-2(3m + 9) =
TiliK225 [7]

Answer:

  1. 8x +40
  2. -6m-18

Step-by-step explanation:

8(x + 5) =  \\ 8(x) + 8(5) \\  = 8x + 40

- 2(3m + 9) \\  =  - 2(3m)  - 2(9) \\  =  - 6m - 18

7 0
2 years ago
Solve this problem as FAST as YOU can
natka813 [3]

That's actually tough

3 0
2 years ago
If terrance ran 12mph and jesse ran 8mph how long will it take them to run 50 miles
Sholpan [36]

Answer:

Terrance would take 4.2666 hours, Jesse would take 6.25 hours

Step-by-step explanation:

1h/12m per hour x 50m/1h is also 50m/12m per hour = 4.266 hours (round number)

1h/8m per hour is also 50m/8m per hour = 6.25 hours (round number)

6 0
2 years ago
1. Convert 36 inches into feet. A. 3.5 ft B. B. 3 ft C. 2.5 ft D. 2 ft​
deff fn [24]
The answer is Option B , the solution is 3
6 0
2 years ago
Read 2 more answers
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