In factorization, we write the middle term of the quadratic equation either as a sum of two numbers or difference of two numbers such that the equation can be factorized.

⇒ 3(x² – 11x + 28) + 3(x² – 11x + 30) = 10(x² – 12x + 35)

⇒ 4x² – 54x + 176 = 0

⇒ 2x² – 27x + 88 = 0

⇒ 2x² – 16x – 11x + 88 = 0

⇒ 2x(x – 8) – 11(x – 8) = 0

⇒ (2x – 11)(x – 8) = 0

⇒ x = 11/2, 8