Question

is x= -4 solution of the equation 2x+5x-12=0​

Answer 1

Put the value of x on the equation. If it satisfies the equation then x = - 4 will be a solution of equation.

$2x + 5x - 12 = 0 \\ \\ 7x - 12 = 0 \\ \\ 7( - 4) - 12 = 0 \\ \\ - 28 - 12 = 0 \\ \\ - 40 = 0$

Since LHS is not equal to RHS,

X = - 4 is not a solution of this equation.

Answer 2

Hopefully this hepls i tried my best to do it nd i hope this answer is correct