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anonymous
 one year ago
please help with this problem
3x^3+4x^2=27x+36
anonymous
 one year ago
please help with this problem 3x^3+4x^2=27x+36

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misty1212
 one year ago
Best ResponseYou've already chosen the best response.1you have a cubic equation to solve?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0yes can you please explain all the steps for me

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1there is a formula for solving cubes, but it is almost incomprehensible start with \[3x^3+4x^227x36=0\] and then make an educated guess , which is really all you ca ndo

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1i guess 3, since 1 and 1 do not work shall we try it?

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1i;ll be damned, it works!

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1got it in the first try so this is \[(x3)(\text{ some quadratic})\]which you can find using synthetic division or long division (ugh) or thinking (or cheating)

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1i can't write synthetic division here, but i can cheat or think you pick

misty1212
 one year ago
Best ResponseYou've already chosen the best response.1http://www.wolframalpha.com/input/?i=3x%5E3%2B4x%5E227x36%3D0

JohnN.
 one year ago
Best ResponseYou've already chosen the best response.0Let's solve your equation stepbystep. 3x3+4x2=27x+36 Step 1: Subtract 27x+36 from both sides. 3x3+4x2−(27x+36)=27x+36−(27x+36) 3x3+4x2−27x−36=0 Step 2: Factor left side of equation. (x+3)(x−3)(3x+4)=0 Step 3: Set factors equal to 0. x+3=0 or x−3=0 or 3x+4=0 x=−3 or x=3 or x=−43 Answer: x=−3 or x=3 or x=−43
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