Differentiate (x2+5x−64x2−x+3)
Using the quotient rule, we have
ddx (x2+5x−64x2−x+3)
=(4x2−x+3).ddx(x2+5x−6)−(x2+5x−6).ddx(4x2−x+3)(4x2−x+3)2
=(4x2−x+3)(2x+5)−(x2+5x−6)(8x−1)(4x2−x+3)2=(9+54x−21x2)(4x2−x+3)2