(b+h)(b+h)= b2+2hb+h2.
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The expression (a+b) + (a-b) can be rewritten as a + b + a - b = 2a.There is no need to use absolute value.
When factored it is: 12(A+b)
it think ot is 5(a+b)
It is: b+b+b = 3b
3+2*A+B*4/2-4 = 3 + 2A + 2B - 4 = 2A + 2B - 1