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NatalieLove
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1. Solve 5x2 = –45x 1. Solve 5x2 = –45x @Mathematics
 2 years ago
 2 years ago
NatalieLove Group Title
1. Solve 5x2 = –45x 1. Solve 5x2 = –45x @Mathematics
 2 years ago
 2 years ago

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

joemath314159 Group TitleBest ResponseYou've already chosen the best response.1
when 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:\[5x^2=45x\iff5x^2+45x=0\iff 5x(x+9)=0\iff x=0,x=9 \]
 2 years ago

NatalieLove Group TitleBest ResponseYou've already chosen the best response.1
either is good answer
 2 years ago

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

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

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