Simplifying
(2 + 5x)(11 + 12x)

Multiply (2 + 5x) * (11 + 12x)
(2(11 + 12x) + 5x * (11 + 12x))
((11 * 2 + 12x * 2) + 5x * (11 + 12x))
((22 + 24x) + 5x * (11 + 12x))
(22 + 24x + (11 * 5x + 12x * 5x))
(22 + 24x + (55x + 60x2))

Combine like terms: 24x + 55x = 79x
(22 + 79x + 60x2)