Question

Tolog pake cara dijawa

Answer 1

1. a. 8p-3+(-3p)+8=0
=> 8p-3p-3+8=0
=> 5p-5=0
=> 5p=5
=> p=1

    b. 9m+4mn+(-12m)-7mn
=> 9m+4mn=12+7mn
=> m(9+4n)=m(12+7n)
=> 9+4n=12+7n
=> 4n-7n=12-9
=> -3n=3
=> n=-1
*substitusi variabel n ke persamaan: m(9+4n)=m(12+7n)*
m(9+4(-1)=m(12+7(-1)
=> 5m=5m
=> m=0

     c. 2a^2+3ab-7-5a^2+2ab-4
=> 2a^2-5a^2+3ab+2ab=11
=> -3a^2+5ab=11
=> 3a^2-5ab=-11 (Dikalikan dengan -1)
=> a(3a-5b)=-11
=> 3a^2-5ab+11=0

     d. 4x^2-3xy+7y-5x^2+2xy-4y
=> 4x^2-5x^2+7y-4y-3xy+2xy
=> -x^2+3y-xy
=> x^2-3y+xy (Dikalikan dengan -1)
  
     e. -4p^2+3pq-2-6p^2+8pq-3
=> -4p^2-6p^2+3pq+8pq-2-3
=> -10p^2+11pq-5
=> 10p^2-11pq+5 (Dikalikan dengan -1) 
    
     f. 12kl-20mn-5kl-3mn
=> 12kl-5kl-20mn-3mn
=> 7kl-23mn