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First, you have to find which two numbers go into 24 when multiplied.
24=
6×4
2×12
24×1
-6×4
-2×12
-24×1
Then you add each set of numbers together.
6+4=10
2+12=14
24+1=25
-6+4=-2
-2+12=10
-24+1=-23
6+(-4)=1
2+(-12)=-10
24+(-1)=23
Then you find which set when added makes 4. Since none of these are 4, it is no solution.
To simplify this, we must combine like terms.
3x, -3x, and 5x will be combined with each other
3 and 7 will be combined
3x-3x+5x= 5x
3+7=10
so our simplified expression is <em><u>5x+10</u></em>
Draw out a number line. Plot an open circle at -8. Shade to the right of this open circle. You'll find that -7, -6 and -5 are in this shaded region.
So this is why the answer is choice A
