kismith25 kismith25

08-10-2021
Mathematics

contestada

Solve: x + 3(x+4) = 5x
a) There are infinitely many solutions
b) x = -12 is a solution to the equation.
c) There is no solution
d) x = 12 is a solution to the equation.

Respuesta :

08-10-2021

The answer is D

x+3(x+4)=5x
x+(3x+3·4)=5x
x+(3x+12)=5x
x+3x+12=5x
4x+12=5x
(4x+12)+(−4x)=5x+(−4x)
4x+12−4x=5x−4x
4x−4x+12=x
12=x
x=12

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