Question

sinplify (a) – xy² – xy² – xy²
(b) abc - abc + abc
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Answer 1

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(6a + 8b - 7c) + (2b + c - 4a) + (a - 3b - 2c)

= 6a + 8b - 7c + 2b + c - 4a + a - 3b - 2c

Arrange the like terms together, then add.

Thus, the required addition

= 6a - 4a + a + 8b + 2b - 3b - 7c + c - 2c

= 3a + 7b - 8c

Answer 2

(A) x 2

+y

2

+z

2

+2xy+2yz+2zx

-xy²-xy²-xy²

-(xy) ² -(xy) ²-(xy) ²-2(xy)(xy) -2(xy)(xy) -2(xy)(xy)

-xy²-xy²-xy²-2(2x)(2y)-2(2x)(2y)-2(2x)(2y)

(B)