What is the unknown number in the sequence in chart 2 21 42 63 105 and ?

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.

answer:   x = 3 + √11     and     x = 3 - √11

step-by-step explanation:

x² - 6x + 9 = 11

(x - 3)² = 11

x - 3 = ±√11

    x = 3 ± √11

x = 3 + √11     and     x = 3 - √11

there is no answer sorry!

step-by-step explanation: