Question

Resolva as equações em R​

Answer 1

a)

-15x +9x +4x = 1

-15x +13x = 1

x = -1/2

b)

3x +75 +20 +18 -12 -45 -50 -2x = 0

3x -2x +75 -45 +20 -50 +18 -12 = 0

x +30 +20 -50 +6 = 0

x +6 = 0

x = -6

c)

2x +3x +2x² +2x -6x² -x -1 -2x = 0

-6x² +2x² +3x -x -2x +2x +2x -1 = 0

-4x² +4x -1 = 0

16 -4 * -4 * -1

16 -16 = 0

(-4 ± 0)/(-4 * 2)

x = 1/2

d)

-x² -4x +12 -2x -12 -2x² = 0

-3x² -6x = 0

-3x(x +2) = 0

x' = 0 ; x'' = -2