3 years ago

Number 9 plssss I need help

Mathematics

1 answer:

soldi70 [24.7K]3 years ago

5 0

For number 9 the answer is B

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2x² - 5x+1 has roots alpha and beta. Find alpha⁴+beta⁴ without solving the equation.

shepuryov [24]

Answer:

Step-by-step explanation:

$\alpha+\beta=\dfrac{5}{2} \\\\\alpha*\beta=\dfrac{1}{2} \\\\\alpha^2+\beta^2=\dfrac{21}{4} \ (see\ previous\ post)\\\\(\alpha+\beta)^4=\dfrac{625}{16} \\\\=\alpha^4+\beta^4+4*\alpha^3*\beta+6*\alpha^2*\beta^2+4*\alpha*\beta^3\\\\=\alpha^4+\beta^4+4*(\alpha*\beta)(\alpha^2+\beta^2)+6*\alpha^2*\beta^2\\\\\alpha^4+\beta^4=(\alpha+\beta)^4-4*(\alpha*\beta)(\alpha^2+\beta^2)-6*\alpha^2*\beta^2\\\\= \dfrac{625}{16} -4*\dfrac{1}{2} *\dfrac{21}{4} -6*(\dfrac{1}{2})^2 \\\\$

$= \dfrac{625}{16}- \dfrac{168}{16}-\dfrac{24}{16}\\\\\\= \dfrac{433}{16}$

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3 years ago

Can someone please help me with this question?<br><br> Find the value of c-5 when c=14

vlada-n [284]

1) C-5
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3 years ago

Whats 10 divide 8 by doing long division? HELP

olganol [36]

Your answer is 1.25

dividing:

Set up the equation. On a piece of paper, write the dividend (number being divided) on the right, under the division symbol, and the divisor (number doing the division) to the left on the outside. ...

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Divide the first two digits. ...

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Read 2 more answers

Ken Ken 5x5 please help

Levart [38]

Answer:

5x5= 25

Step-by-step explanation:

5+5+5+5+5= 25

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3 years ago