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OpenStudy (anonymous):
factor 40r^3+22r^2-6r
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hero (hero):
r(40r^2+22r-6) r(40r^2 -8r + 30r - 6) r(-8r(-5r+1)-6(-5r+1)) r((-5r+1)(-8r-6))
OpenStudy (anonymous):
discriminant is zero so,can solve only by complex numbers
hero (hero):
Actually, If you set it equal to zero and solve for r, you get r = 0,-3/4, 1/5
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