Question

Mee ayudan por favor : (2x + 3)² = 81

Answer 1

(2x + 3)^2 = 81
(2x + 3)^2 - 9^2 =
[(2x + 3) - 9] [(2x + 3) + 9]
(2x -6)(2x + 12)
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         2
(x - 3)(x + 6) //

Answer 2

(2x+3)²=81
2x+3=√81
2x+3=9
2x=6
Sale: x=3