a^2+9b^2-4c^2+6ab = (a+3b+2c)(a-3b+2c)(m+2)(m^2+m) = m(m+2)(m+1)(m+2)(4-m) = (m+2)(-m+4) = -(m+2)(m-4)1+4ab-a^2-4b^2 = (1+a)(1-a)-4b(1+a) = -(a-1)(a+1+4b)(m-1)(m^2-8m) = m(m-1)(m-8) = m(m-1)(-8+m) = -m(m-1)(m-8)(m-1)(2m+9) = 2m(m-1)+9(m-1) = 2m^2-2m+9m-9 = 2m^2+7m-9
a^2+9b^2-4c^2+6ab = (a+3b+2c)(a-3b+2c)
(m+2)(m^2+m) = m(m+2)(m+1)
(m+2)(4-m) = (m+2)(-m+4) = -(m+2)(m-4)
1+4ab-a^2-4b^2 = (1+a)(1-a)-4b(1+a) = -(a-1)(a+1+4b)
(m-1)(m^2-8m) = m(m-1)(m-8) = m(m-1)(-8+m) = -m(m-1)(m-8)
(m-1)(2m+9) = 2m(m-1)+9(m-1) = 2m^2-2m+9m-9 = 2m^2+7m-9