Question

using suitable identity solve
(3x-7)(3x+11)​

Answer 1

Answer:

$(3x - 7)(3x + 11) \\ identity \: is \: (x + a)(x + b) = {x }^{2} + (a + b)x + ab \\ (3x - 7)(3x + 11) = (3 {x}^{2} + ( - 7 + 11)3x + ( - 7 \times 11) \\ 9 {x}^{2} + (4)3x - 77 \\ 9 {x}^{2} + 12x - 77$