Class 8 Exam > Class 8 Questions > Add: 7xy + 5yz – 3zx, 4yz + 9zx –...
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Add: 7xy + 5yz – 3zx, 4yz + 9zx – 4y , –3xz + 5x – 2xy.
- a)5xy + 3zx + 5x – 4y
- b)5xy + 9yz +2zx + 5x – 4y
- c)5xy + 9yz +3zx + 5x – 4y
- d)5xy + 9yz +3zx + 4y
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Add: 7xy + 5yz – 3zx, 4yz + 9zx – 4y , –3xz + 5x &nd...
Writing the three expressions in separate rows, with like terms one below the other, we have
7xy + 5yz – 3zx
+ 4yz + 9zx – 4y
+ –2xy – 3zx + 5x
-----------------------------------------
= 5xy + 9yz + 3zx + 5x – 4y
Thus, the sum of the expressions is 5xy + 9yz + 3zx + 5x – 4y. Note how the terms, – 4y
in the second expression and 5x in the third expression, are carried over as they are, since
they have no like terms in the other expressions.
Most Upvoted Answer
Add: 7xy + 5yz – 3zx, 4yz + 9zx – 4y , –3xz + 5x &nd...
THE CORRECT ANSWER IS OPTION C .
7xy+5yz-3zx+4yz+9zx-4y+-3xz+5x-2xy
ADDING THE LIKE TERMS ONLY (Like terms are the terms with same variable and powers even though they are of different coefficients)
Checking the like terms and group them together
7xy-2xy +5yz+4yz -3zx+9zx-3xz -4y+5x
= 5xy+9yz+3zx-4y+5x
7xy+5yz-3zx+4yz+9zx-4y+-3xz+5x-2xy
ADDING THE LIKE TERMS ONLY (Like terms are the terms with same variable and powers even though they are of different coefficients)
Checking the like terms and group them together
7xy-2xy +5yz+4yz -3zx+9zx-3xz -4y+5x
= 5xy+9yz+3zx-4y+5x
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Community Answer
Add: 7xy + 5yz – 3zx, 4yz + 9zx – 4y , –3xz + 5x &nd...
The given expression is 7xy + 5yz.
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Add: 7xy + 5yz – 3zx, 4yz + 9zx – 4y , –3xz + 5x – 2xy.a)5xy + 3zx + 5x – 4yb)5xy + 9yz +2zx + 5x – 4yc)5xy + 9yz +3zx + 5x – 4yd)5xy + 9yz +3zx + 4yCorrect answer is option 'C'. Can you explain this answer?
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