Question 211320This question is from textbook Elementary and Intermediate Algebra, 3e
: I really do not understand any of this stuff...can I get some help please?
#80: find all real and imaginary solutions to each equation
w^2= -225
#96: sqrt 7x + 29 = x + 3
This question is from textbook Elementary and Intermediate Algebra, 3e
Answer by RAY100(1637)   (Show Source):
You can put this solution on YOUR website! #80) w^2 =-225
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w = +/- sqrt (-225)
w=+/- sqrt(225)(-1)
w= +/- 15 i,,,,,,where i=sqrt(-1)
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#96),,,,sqrt(7x+29) = x+3,,,,,,,square both sides
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(7x+29) = x^2 +6x +9
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0= x^2 -x -20
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0=(x-5)(x+4)
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x=5,,,-4
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check,,,(5),,,sqrt(35+29)=sqrt(64) = 8 = 5+3,,,,,ok
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(-4),,,,sqrt (-28 +29) = sqrt(1) =+/- 1 = -4 + 3= -1,,,,,ok
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