Question

Solve 2(4x + 3) < 5x + 21.

{x | x < 9}
{x | x > -5}
{x | x > -9}
{x | x < 5}

Answer 1

2(4x + 3) < 5x + 21
multiply out the 2:
8x + 6 < 5x + 21

subtract 5x from both sides:
8x + 6 -5x < 5x + 21 -5x
3x + 6 < 21

subtract 6 from both sides:
3x + 6 -6 < 21 -6
3x < 15

can you handle it from here?

Answer 2

so you get rid the 3 so you have to subtract the three

Answer 3

or dvide the 15 by 3 and get 5