Question

indique a,b.c a) (2x+3)² =9 b) (x -6)+7x=x²-x c) 2x+6.(x+5)=x²+5​

Answer 1

Resposta:

a) (2x+3)² =9

(2x)²+2.2x.3+3²-9=0

4x²+12x+9-9=0

4x²+12x=0

a = 4

b = 12

c = 0

b) (x -6)+7x=x²-x

x-6+7x-x²+x=0

-x²+9x-6=0

a = -1

b = 9

c = -6

c) 2x+6.(x+5)=x²+5

2x+6x+30-x²-5=0

-x²+8x+25=0

a = -1

b = 8

c = 25