add the following expressions
A)3mn, -5mn, 8mn, -4mn
B) a+b-3, b-a+3, a-b+3
C)3p2q2 -4pq +5, -10p2q2, 15+9pq +7p2q2
Answers
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Step-by-step explanation:
(a) 3mn,-5mn,8mn,-4mn
=> 3mn + (-5mn) +8mn +(-4mn)
=> 3mn + (-5mn) +8mn +(-4mn)=> 11mn +(-9mn) => 11mn-9mn => 2mn
(b) a+b-3, b-a+3,a-b+3
=> (a+b-3) + (b-a+3) + (a-b+3)
=> a+b-3+b-a+3+a-b+3
=> a-a+a+b+b-b-3+3+3
=> a+b+3
(c) 3p²q²-4pq+5, -10p²q², 15+9pq+7p²q²
=> (3p²q²-4pq+5) +(-10p²q²)+ (15+9pq+7p²q²)
=> 3p²q²-4pq+5 -10p²q² +15+9pq+7p²q²
=> 3p²q²-10p²q²+7p²q² -4pq+9pq+5+15
=> 10p²q²-10p²q² +5pq+20
=> 5pq+20
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