Answer:
19. H
20. T
Step-by-step explanation:
19.
Let's simplify step-by-step.
8a−5b−3a+7b
=8a+−5b+−3a+7b
Combine Like Terms: (8a and -3a, 5b and 7b)
=8a+−5b+−3a+7b
=(8a+−3a)+(−5b+7b)
=5a+2b
20.
Let's simplify step-by-step.
6a−3b+4c−(4a+3b−c)
Distribute the Negative Sign:
=6a−3b+4c+−1(4a+3b−c)
=6a+−3b+4c+−1(4a)+−1(3b)+−1(−c)
=6a+−3b+4c+−4a+−3b+c
Combine Like Terms: (6a and 4a,3b and 3b,4c and c)
=6a+−3b+4c+−4a+−3b+c
=(6a+−4a)+(−3b+−3b)+(4c+c)
=2a+−6b+5c
