12x2 + 60x + 75 = ?
12x2 + 60x + 75
By using Splitting the middle term
12 x2 + 60x + 75
= 3(4 x2 + (10 + 10)x + 25)
= 3(2x(2x + 5) + 5(2x + 5))
= 3(2x + 5)(2x + 5)