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cnebbear
 2 years ago
I think my math book is wrong...but I don't know. Could someone check and if it's not wrong, explain it to me?
cnebbear
 2 years ago
I think my math book is wrong...but I don't know. Could someone check and if it's not wrong, explain it to me?

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nubeer
 2 years ago
Best ResponseYou've already chosen the best response.0hmm what is your math book answer?

cnebbear
 2 years ago
Best ResponseYou've already chosen the best response.0That is the math book answer

nubeer
 2 years ago
Best ResponseYou've already chosen the best response.0hmm and what is your answer?

cnebbear
 2 years ago
Best ResponseYou've already chosen the best response.0I know this can't be right but I got x=2.5. I don't understand how they randomly got the extra 2 when it should be a 9.

nubeer
 2 years ago
Best ResponseYou've already chosen the best response.0ok.. i also have got a different answer but not sure.. so can you put steps how you solve it?

__assassin__
 2 years ago
Best ResponseYou've already chosen the best response.0it looks like its just a typing error, try asking or calling your teacher

RadEn
 2 years ago
Best ResponseYou've already chosen the best response.081x  21x = 24 60x = 24 x = 24/60 = 2/5

cnebbear
 2 years ago
Best ResponseYou've already chosen the best response.0Yeah it's about evaluating determinants of a matrix. How I solved the problem was: (0)(1)(3)+(7)(2)(0)+(9)(x)(9) (0)(1)(9)(9)(2)(0)(3)(x)(7) 0+0+81x0021x=24 60x=24 x=2.5

phi
 2 years ago
Best ResponseYou've already chosen the best response.0See http://www.wolframalpha.com/input/?i=det+%7B+%7B0%2C7%2C9%7D%2C%7B0.4%2C1%2C2%7D%2C%7B0%2C9%2C3%7D%7D x= 0.4 so there must be a typo somewheres?

phi
 2 years ago
Best ResponseYou've already chosen the best response.060x=24 x=2.5 ?? don't you think it is x= 24/60 = 2/5

phi
 2 years ago
Best ResponseYou've already chosen the best response.0See http://www.wolframalpha.com/input/?i=det+%7B+%7B0%2C7%2C9%7D%2C%7B0.4%2C1%2C2%7D%2C%7B0%2C9%2C3%7D%7D x= 0.4 so there must be a typo somewheres?

phi
 2 years ago
Best ResponseYou've already chosen the best response.0The book's solution would be correct if the first line of the matrix were 0 7 2 (rather than 0 7 9)
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