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ParthKohli
Group Title
Solve \(x(x + 3) = 9\) NOT by the quadratic formula.
 one year ago
 one year ago
ParthKohli Group Title
Solve \(x(x + 3) = 9\) NOT by the quadratic formula.
 one year ago
 one year ago

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PeterPan Group TitleBest ResponseYou've already chosen the best response.0
Well, clearly x cannot be positive, as that would mean x+3 is positive too. x must be negative, but no less than 3, or else x+3 would also be negative.
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.0
Complex numbers?
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.0
I know them by the quadratic formula
 one year ago

PeterPan Group TitleBest ResponseYou've already chosen the best response.0
Oh, right. I forgot to assume the realness of x... I'm lost :D
 one year ago

phi Group TitleBest ResponseYou've already chosen the best response.1
you can complete the square as an alternative to the quadratric formula
 one year ago

PeterPan Group TitleBest ResponseYou've already chosen the best response.0
That's kinda like using the quadratic formula anyway? :D
 one year ago

phi Group TitleBest ResponseYou've already chosen the best response.1
you will get complex roots
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.0
Well\[x^2 + 3x + 2.75 = 9 + 2.75\]
 one year ago

PeterPan Group TitleBest ResponseYou've already chosen the best response.0
What's with the 2.75? You mean 2.25, right?
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.0
Yes, whoops
 one year ago

sami21 Group TitleBest ResponseYou've already chosen the best response.0
can i use compeleting square ??? or factor mehod ?
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.0
\[(x + 1.5)^2 = 9 + 2.25\]Yes, I wanna know how to factor this over \(\mathbb C\) without knowing the roots!
 one year ago

PeterPan Group TitleBest ResponseYou've already chosen the best response.0
It seems like it's already almost done?
 one year ago

sami21 Group TitleBest ResponseYou've already chosen the best response.0
well, i guess this is a good condidate for completing square .
 one year ago

ParthKohli Group TitleBest ResponseYou've already chosen the best response.0
OK, completing the square worked out well. Thanks @phi :)
 one year ago
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