Question

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Resolver las siguientes ecuaciones
7× + 4 =(-6) (×-1)-15

-1.(8-6×)=(2+3×).(-2)+2^3

(×-4)^2.9=81

Answer 1

7x + 4 = (-6).(x-1) -15
7x + 4 = (-6x) + 6 - 15
7x + 6x = 6 -15 - 4
13x = -13
x = -1

-1.(8-6x) = (2+3x).(-2)+ 2³
(-8)-(-6x) = (-4)+(-6x) + 8
-8 + 6x = -4 - 6x +8
-8 +4 -8 = -6x - 6x
-12 = -12x
-1 = -x
1 = x

(x-4)² .9 = 81
(x²-16).9 = 81
9x² - 144 = 81
9x² = 81 +144
9x² = 225
x² = 25
x = 5