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Mathematics 16 Online
OpenStudy (snowcrystal):

Help Please

OpenStudy (anonymous):

What do you need help on?

OpenStudy (snowcrystal):

I need to put this equation into the quadratic formula and dont know how to

OpenStudy (snowcrystal):

\[x(x-5)=-4\]

OpenStudy (anonymous):

Yeah. I don't know how to do those sorry :(

OpenStudy (snowcrystal):

its okay :)

OpenStudy (ipwnbunnies):

Just multiply the x into both terms, subtract the 4 from the other side so the whole thing equals 0.

OpenStudy (snowcrystal):

huh?

OpenStudy (ipwnbunnies):

x(x-5) --> You have to multiply x times x, then x times -5. You're distributing the x to that term (x-5). What would that be?

OpenStudy (snowcrystal):

\[x^2 -5x =-4\]

OpenStudy (ipwnbunnies):

Right! Now add 4 to both sides to get rid of the -4 on the right side. It'll now be equal to 0.

OpenStudy (snowcrystal):

\[x^2-1x =0\]

OpenStudy (ipwnbunnies):

Incorrect, you're just adding the 4 to both sides, you're not doing anything to the x^2 -5x

OpenStudy (snowcrystal):

oh

OpenStudy (ipwnbunnies):

Because the number 4 is not like x^2 or -5x

OpenStudy (snowcrystal):

\[x^2 -5x +4\]

OpenStudy (ipwnbunnies):

Right

OpenStudy (snowcrystal):

so when i put it into the quadratic formula it look like this \[\frac{ -5\pm \sqrt{-5^2 - 4 *1*4} }{ 2*1 }\]

OpenStudy (snowcrystal):

right?

OpenStudy (ipwnbunnies):

Oh lol. The very first term is -b, which would be 5 instead of -5.

OpenStudy (snowcrystal):

oh okay

OpenStudy (ipwnbunnies):

Be careful, follow order of operations!

OpenStudy (snowcrystal):

i will thx for the help

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