Question

(3X+9)²=

QUADRADRO DE UMA SOMA

(4a+2b)²=

Answer 1

(3x +9)² = ( 3x)² + 2 . 3x . 9 + 9²

                   9x² + 54x + 81

-----------------------------------------------

( 4a + 2b )² =  ( 4a )² + 2 . 4a . 2b + ( 2b)²

                         16a² + 16ab + 4b²