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3 years ago

12

Math: Slope help please

2 answers:

pishuonlain [190]3 years ago

3 0

Slope = (2+5)/(-3-1) = 7/-4 = -7/4

answer is B -7/4

swat323 years ago

3 0

(y2-y1) divided by (x2-x1)
In your case:
(2-5) divided by (-3-1)
Answer: -3/4

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If z^2+1/z^2=11 , find the value of z^3-1/z^3,using only the positive value of z-1/z

vredina [299]

Hello,

Let's assume

$t=z- \dfrac{1}{z} \\\\

t^2=z^2-2+ \dfrac{1}{z^2}= 11-2=9==\ \textgreater \ t=3\\\\

t^3=z^3-3z^2* \dfrac{1}{z} +3z* \dfrac{1}{z^2} - \dfrac{1}{z^3} \\\\
=z^3 - \dfrac{1}{z^3} -3(z-\dfrac{1}{z})\\\\
z^3 - \dfrac{1}{z^3}=t^3+3t=3^3+9=27+9=36


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