Struggling with Inequalities

[MARIE]

I am really struggling with inequalities. Am I doing these correctly?

-2x(x+6) > x+4
-2x-12+12 > x+4+12
-2x > x+16
-2x-x > 16
-3x >16
-3/3x > -16/3
(x, -16/3)


2(4-3/5q) < 5
8 - 30q < 5
-30q < 5 - 8
-30q < -3
-30q/-30 < -3/-30
q < 1/10
(q, 1/10)

 

[Denis]

-2x(x+6) > x+4
-2x-12+12 > x+4+12

No; -2x(x + 6) = -2x^2 - 12x

Your problem is not inequalities, but the basics; see your teacher.