Question

Reduza as equações do 2° grau:
a) (x-5)² -9 = 0

b) (x+1)² - x = 7

c) (x+4)² = 3 (x+2)

d) (x-2) (x+1) = 3

e) 4x² -1 =(x+3) (x-3)

Answer 1

Bom dia!!

a) (x -5)² -9 = 0
x² -10x +25 -9 = 0
x² -10x +16 = 0

b) (x +1)² -x = 7
x² +2x +1 -x -7 = 0
x² +x -6 = 0

c) (x +4)² = 3.(x +2)
x² +8x +16 = 3x +6
x² +8x -3x +16 -6 = 0
x² +5x +10 = 0

d) (x-2).(x +1) = 3
x² +x -2x -2 -3 = 0
x² -x -5 = 0

e) 4x² -1 = (x+3).(x-3)
4x² -1 = x² -3x +3x -9
4x² -x² -1 +9 = 0
3x² +8 = 0

Bons estudos!