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ParthKohli
 2 years ago
Solve \(x(x + 3) = 9\) NOT by the quadratic formula.
ParthKohli
 2 years ago
Solve \(x(x + 3) = 9\) NOT by the quadratic formula.

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PeterPan
 2 years ago
Best ResponseYou've already chosen the best response.0Well, 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.

ParthKohli
 2 years ago
Best ResponseYou've already chosen the best response.0I know them by the quadratic formula

PeterPan
 2 years ago
Best ResponseYou've already chosen the best response.0Oh, right. I forgot to assume the realness of x... I'm lost :D

phi
 2 years ago
Best ResponseYou've already chosen the best response.1you can complete the square as an alternative to the quadratric formula

PeterPan
 2 years ago
Best ResponseYou've already chosen the best response.0That's kinda like using the quadratic formula anyway? :D

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

PeterPan
 2 years ago
Best ResponseYou've already chosen the best response.0What's with the 2.75? You mean 2.25, right?

sami21
 2 years ago
Best ResponseYou've already chosen the best response.0can i use compeleting square ??? or factor mehod ?

ParthKohli
 2 years ago
Best 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!

PeterPan
 2 years ago
Best ResponseYou've already chosen the best response.0It seems like it's already almost done?

sami21
 2 years ago
Best ResponseYou've already chosen the best response.0well, i guess this is a good condidate for completing square .

ParthKohli
 2 years ago
Best ResponseYou've already chosen the best response.0OK, completing the square worked out well. Thanks @phi :)
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