Question

determine the subusting -3 is the root of x+12=9

Answer 1

Answer:

x+12=9

x=9-12

x=-3

so,

-3 is the root of x+12=9

Step-by-step explanation:

Answer 2

if -3 is the root of this equation then it must satisfy the equation, that is
l. h. s=r.h.s
now substituting the value in equation,
x+12=9
-3+12=9
9=9
since l. h. s=r.h.therefore -3is the root of this equation