12. Factorise : (a -b} +(a -b)
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Answer:
(a - b) + (a - b) = 2a - 2b
Step-by-step explanation:
If + sign outside bracket then don't change sign but if negative sign then changes sign inside the bracket.
(a - b) + (a - b)
Remove bracket without changing sign
= a - b + a - b
Rearrange similar term
= a + a - b - b
= 2a - 2b
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