Question

simplifique :
a) 2x - 4 + (x+2)² - 2 (x-2)

b) (2a+3) · (2a-3) -2a² + (a-3)

c) (5+x)² - (x-5)² + (x+5) · (x-5)

URGENTE !!!

Answer 1

a) 2x - 4 + (x+2)² - 2 (x-2)

2x-4+x²+4x+4-2x+4

x²+2x+4x-2x-4+4+4

x²+4x+4

b) (2a+3) · (2a-3) -2a² + (a-3)

4a²-9-2a²+(a-3)

2a²-9+a-3

2a²-12+a

2a²+a-12

c) (5+x)² - (x-5)² + (x+5) · (x-5)

10*2x+(x+5)*(x-5)

20x+x²-25

x²+20x-25