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NatalieLove
 4 years ago
1. Solve 5x2 = –45x 1. Solve 5x2 = –45x @Mathematics
NatalieLove
 4 years ago
1. Solve 5x2 = –45x 1. Solve 5x2 = –45x @Mathematics

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steveh1014
 4 years ago
Best ResponseYou've already chosen the best response.0x^2 = 45x / 5 x = 45/5 x=9

joemath314159
 4 years ago
Best ResponseYou've already chosen the best response.1when you divide by x, you lose a solution. The original equation is quadratic, so there are two solutions. One of them can be obtained in the manner above, but you lost the other. So solve like this instead, so you get both:\[5x^2=45x\iff5x^2+45x=0\iff 5x(x+9)=0\iff x=0,x=9 \]

NatalieLove
 4 years ago
Best ResponseYou've already chosen the best response.1either is good answer

joemath314159
 4 years ago
Best ResponseYou've already chosen the best response.1right, both will solve the problem. sometimes the question will want both solutions though. just a heads up :)

NatalieLove
 4 years ago
Best ResponseYou've already chosen the best response.1just in case do i add x = 0 to the answer ?

steveh1014
 4 years ago
Best ResponseYou've already chosen the best response.0they are both viable solutions so supplying one or the other wont make you wrong
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