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OpenStudy (anonymous):
Can someone help me solve this please? 4x^3+12x^2-40x=0
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OpenStudy (studygurl14):
First, factor out 4x
OpenStudy (anonymous):
Okay.
OpenStudy (studygurl14):
Tell me what you get.
OpenStudy (anonymous):
4x(-10+3x+x^2)
OpenStudy (studygurl14):
Yes, now factor (x^2 + 3x - 10)
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OpenStudy (anonymous):
x+5 x-2
OpenStudy (mathstudent55):
Your factoring is correct. Now you have 4x(x + 5)(x - 2) = 0 Set each factor equal to zero and solve each equation.
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