Question

7. Simplifique a expressão
( x + 5 ) ²+ ( 2x - 1 ) ²+ ( x + 3 ) . ( x - 3 )

Answer 1

( x + 5 ) ²+ ( 2x - 1 ) ²+ ( x + 3 ) . ( x - 3 )

x² + 10x + 25 + ( 4x -2x +1) + x² - 3x  + 3x - 9

x² + 10x + 25 +4x - 2x + 1 + x² - 3x + 3x - 9

2x² + 12x  + 15