If A= 5x + 11y - 15z, B= 12x - 13y + 19z, C= 7x - 6y + 21z,
find d 2A + 3B - C
Answers
Answered by
0
Answer:
Ans 39x-11y+6z
Step-by-step explanation:
A = 5x + 11y - 15z
B = 12x - 13y + 19z
C = 7x - 6y + 21z
TO FIND – 2A + 3B - C
2A + 3B - C = 2(5x+11y-15z) + 3(12x-13y+19z) - (7x-6y+21z)
= 10x+22y-30z + 36x-39y+57z - 7x+6y-21z
= 39x -11y +6z
Answered by
2
Step-by-step explanation:
A = 5x + 11y - 15z
B = 12x - 13y + 19z
C = 7x - 6y + 21z
2A + 3B - C
Substitute the values of A,B and C respectively
= 2 (5x + 11y - 15z) + 3 (12x - 13y + 19z) - (7x - 6y + 21z)
= 10x + 22y - 30z + 36x - 39y + 57z - 7x + 6y - 21z
= 10x + 36x - 7x + 22y - 39y + 6y -30z + 57z - 21z
= 39x - 11y + 6z
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