Question

Which of the following is not an equivalent expression to -12 - 7x?



-7x+ 12
-7x- 12
-7x+ (-12)
-12 + (-7x)

Answer 1

See,
-(+) = -
-(-) = +
+(-) = -
+(+) = +

Use this you will surely get your answer...

Answer 2

It's just a case of you moving the expression around to see if they can match your answers. The only that doesn't match is -7x+12. If you move the expression around, to make it like that, you would get -7x-12, or -7x+ (-12). So the one that doesn't work, is answer A.

Answer 3

the first one, because it has a positive 12, whereas you need a negative 12