Please solve it step by step with explanation in a page and so i will mark you as brainliest and you will be awarded 20 points if u r able to help me..
6..
Simplify: 2a + [- a + (b-a)]
7..
Find the value of x, if (-5) x 3 = -5 + x.
8..
Find the value of a square - 3a if a = 2
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6. 2a + [-a + (b-a)]
= 2a -a + b - a
= 2a -2a +b
= b
(-5)×3 = -5 + x
-15 = -5 + x
-15+5 = x
-10 = x
a=2
-3a = -3×2
-3a = -6
(-3a)²=6² = 36
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