Question

8. Simplify:
a) 18 xy - [ 4yz - {9zx – (7yz - (2xy-2zx)​

Answer 1

Answer:

20xy - 11yz + 7zx

Step-by-step explanation:

Simplify:

18 xy - [ 4yz - {9zx – (7yz - (2xy - 2zx) ​) } ]

= 18 xy - [ 4yz - {9zx – (7yz - 2xy + 2zx​) } ]       (opening bracket)

= 18 xy - [ 4yz - {9zx – 7yz + 2xy - 2zx} ]          (opening bracket)

= 18 xy - [ 4yz - {7zx – 7yz + 2xy} ]                    (simplify)

= 18 xy - [ 4yz - 7zx + 7yz - 2xy ]                       (opening bracket)

= 18 xy - [ 11yz - 7zx - 2xy ]                                (simplify)

= 18 xy - 11yz + 7zx + 2xy                                  (opening bracket)

= 20xy - 11yz + 7zx                                            (simplify)