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liraira [26]
3 years ago
7

Complete the square to solve 2x2 + 20x = 10.

Mathematics
1 answer:
monitta3 years ago
6 0

Answer:

x =  -5 + \sqrt{30}     or   x  =  -5  - \sqrt{30}  

x  is about 0.4772   or x = - 10.4772

Step-by-step explanation:

Start with the equation:    2 * x^2 + 20x = 10

We can divide both sides by 2.

We get:    x^2  + 10x = 5

Let us find the number to complete the square on the left side

(10/2)^2 = 5^2 = 25

Add 25 to both sides

x^2  + 10x   +  25   = 5    +  25

(x + 5)^2   = 30    ,  now I can replace the trinomial  x^2 + 10x + 25 with the binomail squared  (x + 5)^2

Now we solve for x

Take square root of both sides.

x + 5  =   \sqrt{30}    or    x + 5  =  - \sqrt{30}

We get two equations because taking the square root of a number yields a plus and negative number.

x =  -5 + \sqrt{30}     or   x  =  -5  - \sqrt{30}  

x  is about 0.4772   or x = - 10.4772

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Divide 12x^4+17^3+8x-40 by x-2
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Answer:

12x^3 + 24x^2 + 48x + 104 + (5081/x-2)

Step-by-step explanation:

12x^4 + 17* (17*17) + 8x -40/ x-2

1. remove the parenthesis

12x^4 + !7 * 17 * 17 + 8x -40 / x-2

2. multiply 17 by 17

12x^4 + 289 * 17 + 8x -= 40 /x-2

3. multiply 289 by 17

12x^ = 4913 + 8x - 40 / x-2

4. move 4913

12x^4 + 8x + 4913 - 40 / x-2

5. subtract 40 from 4913

12x^4 + 8x + 4873 / x-2

6. set up polynomials to be divided. if there is not a term for every exponent, insert one with a value of 0

x-2 into 12x^4 + 0x^3 + 0x^2 + 8x + 4873

7. divide the highest order term  in the dividend 12x^4 by the highest order term in divisor x = 12x^3

8. multiply by new quotient term

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9. the expression needs to be subtracted from the dividend, so change all the signs in 12x^4 - 24x^3

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10. after changing the signs, add the last dividend from the multiplied polynomial to find new dividend

+24x^3

11.  pull the next term from the original dividend down into the current dividend

+24x^3 + 0x^2

12.  divide the highest order term in the dividend 24x^3 by the highest order term in divisor x = 24x^2

12x^3 + 24x^2

13. multiply new quotient by the divisor

24x^3 * x-2 = 24x^3 - 48x^2

14. the expression needs to be subtracted from the dividend, so change all the signs in 24x^3 - 48x^2

24x^3 + 0x^2 - 24x^3 + 48x^2

15. after changing the signs, add the last dividend from the multiplied polynomial to find new dividend

+48x^2

16. pull the next terms from the original dividend down to the current dividend

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17. divide the highest order term in the dividend 48x^2 by the highest order term in the divisor = 48x

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19. the expression needs to be subtracted from the dividend, so change all the signs in 48x^2 - 96x

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20. after changing the signs, add the last dividend from the multiplied polynomial to find new dividend

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21. pull the next terms from the original dividend down to the current dividend

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22. divide the highest order term in the dividend 104x by the highest order term in the divisor x = 104

23. divide the new quotient by the divisor

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24. the expression needs to be subtracted from the dividend, so change all the signs in 104x - 208

104x + 4873 - 104x + 208 = 5081

25. the final answer is the quotient plus the remainder over the divisor

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