Question

factor 40r^3+22r^2-6r

Answer 1

r(40r^2+22r-6)
r(40r^2 -8r + 30r - 6)
r(-8r(-5r+1)-6(-5r+1))
r((-5r+1)(-8r-6))

Answer 2

discriminant is zero so,can solve only by complex numbers

Answer 3

Actually, If you set it equal to zero and solve for r, you get r = 0,-3/4, 1/5