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noname [10]
3 years ago
9

Rewrite completing the sqaure 3x^2-18x+15

Mathematics
1 answer:
antiseptic1488 [7]3 years ago
4 0
3x^2 - 18x + 15
3x^2 - 18x = -15...divide by 3
x^2 - 6x = - 5...take half of -6, and square it...and add to both sides
x^2 - 6x + 9 = -5 + 9
x^2 - 6x + 9 = 4
(x - 3)^2 = 4
x - 3 = (+-) sqrt 4
x - 3 = (+-) 2
x = 3 (+-) 2

x = 3 + 2 = 5
x = 3 - 2 = 1

so x = 5 and x = 1
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X =4<br> x+y=-6<br> 4x - 3y + 2z = 26
slega [8]

Answer:

x = 4 ,y = -10 , z = -10  

Step-by-step explanation:

Solve the following system:

{y + 4 = -6 | (equation 1)

16 - 3 y + 2 z = 26 | (equation 2)

Express the system in standard form:

{y+0 z = -10 | (equation 1)

-(3 y) + 2 z = 10 | (equation 2)

Swap equation 1 with equation 2:

{-(3 y) + 2 z = 10 | (equation 1)

y+0 z = -10 | (equation 2)

Add 1/3 × (equation 1) to equation 2:

{-(3 y) + 2 z = 10 | (equation 1)

0 y+(2 z)/3 = (-20)/3 | (equation 2)

Multiply equation 2 by 3/2:

{-(3 y) + 2 z = 10 | (equation 1)

0 y+z = -10 | (equation 2)

Subtract 2 × (equation 2) from equation 1:

{-(3 y)+0 z = 30 | (equation 1)

0 y+z = -10 | (equation 2)

Divide equation 1 by -3:

{y+0 z = -10 | (equation 1)

0 y+z = -10 | (equation 2)

Collect results:

Answer: y = -10 , z = -10

6 0
3 years ago
Our family car travels 40 miles in 2 hours. What is our average speed in mph?
slavikrds [6]

Answer:

B. 20 mph

Step-by-step explanation:

To find the average speed, take the distance and divide by the time

40 miles / 2 hours

20 miles per hour

4 0
3 years ago
Read 2 more answers
Dora spent $45 and has $32 left. Which equation can be used to calculate how much money Dora had at the beginning?
r-ruslan [8.4K]
32+45 can be used to figure out the starting amount
7 0
4 years ago
Read 2 more answers
I NEED HELP ASAP!!!!
Advocard [28]

Answer:

The y-int. is 4 and the slope is 1/3

Step-by-step explanation:

4 0
3 years ago
How do you make32/60 a percent
drek231 [11]

32/60 =

32 ÷ 60 ≈

0.533333333333333 =

0.533333333333333 × 100/100 =

0.533333333333333 × 100% =

(0.533333333333333 × 100)% ≈

53.333333333333% ≈

53.33%;

5 0
3 years ago
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