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vagabundo [1.1K]
3 years ago
5

20 POINTS and BRAINLIEST Solve the simultaneous equation!

Mathematics
1 answer:
horrorfan [7]3 years ago
3 0

Answer:

x=7 y=-2

Step-by-step explanation:

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Solve x^3+3x^2-23x-20=0
adoni [48]

Hello from MrBillDoesMath!

Answer:

x = 4

x  =  ( -7 + sqrt(29)) /2

x =   ( -7 - sqrt(29)) /2

Discussion:

x^3+3x^2-23x-20 factors as (x - 4) (x^2 + 7 x + 5) so x =4 is one root

The roots of the quadratic factor, x^2 + 7x + 5, can be found using the quadratic formula where a = 1, b = 7, and c = 5

x =  (  -b +\- sqrt(b^2-4ac)) / 2a

x = ( -7 +\- sqrt( 7^2 - 4*1*5) ) / (2*1) =>

x =  ( -7 +\- sqrt (49-20) ) /  2 =>


The "+" root:    ( -7 + sqrt(29)) /2

The "-" root:    ( -7 - sqrt(29)) /2




Regards,  

MrB


5 0
3 years ago
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