Question

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

Answer 1

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