Question

Me ajudem com essas continhas, por favor!!

Answer 1

2x² +3 = 75

2x² = 75 - 3

2x² = 72

x² = $\frac{72}{2}$

x² = 36

x = $\sqrt{36}$

x = 6

3x² +6x = 0

9x² = 0

x² = 9

x = $\sqrt{9}$

x= 3

a) x² -7x +6 =0

  6x² = -6

   x² =  $\frac{-6}{6}$

   x² = -1

b) -2³ +4x -2 = 0

   -(2.2.2) +4x -2 = 0

   -8 +4x -2 = 0

    4x = 8 +2

    4x = 10

     x = $\frac{10}{4}$

     x = 2,5

c) 6² -6x +10 = 0

   6.6 -6x +10 = 0

   36 -6x +10 = 0

   -6x = -36 -10

   -6x = -46

    x   = $\frac{-46}{-6}$

    x = 7.666...

d) 5x + 2x² -18 = 0

   7x² = 18

    x² = $\frac{18}{7}$