A) 2b
B) 2a
C) \[2a+2b~\]
D) \[2a-2b~\]
Correct Answer: A
Solution :
(a)\[(a+b)+(a-b)=a+b-a+b\]\[=b+b=2b\] It is a good idea to memorize \[(a+b)+(a-b)=2a\] and \[(a+b)-(a-b)=2b\]This will be helpful to expedite your calculations now and also in higher classes.You need to login to perform this action.
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