Question

alguem responde pra mim na ordem e com os cálculo completo pf

Answer 1

a) x² - 12 = 0
x² = 12 --> x = √12 --> x = √4x3 --> x = 2√3

b) x² + 100x = 0
x(x+100) = 0 --> x' = 0 --> x+100 = 0 --> x" = -100

c) 7x² - 21x = 0
7x(x-3) = 0
7x = 0 --> x = 0
x-3 = 0 --> x = 3

d) 3x² - 5 = x²  + x - 5
-5 = x - 5
0 = x --> x = 0

e) 11x² + 13x = 8x
11x² + 13x - 8x = 0
11x² + 5x = 0
x(11x+5) = 0
x' = 0
11x + 5 = 0
11x   = - 5
x" = -5/11

f) -x²-x = 0
x(-x-1) = 0
x = 0
-x-1 = 0
x+1 = 0 --> x = -1