Question

Write each of the following statements by using appropriate grouping symbols:
(i) The sum of a – b and 3a – 2b + 5 is subtracted from 4a + 2b – 7.
(ii) Three times the sum of 2x + y – [5 – (x – 3y)] and 7x – 4y + 3 is subtracted
from 3x – 4y + 7
(iii) The subtraction of x2
– y
2
+ 4xy from 2x2
+ y2
– 3xy is added to
9x2
– 3y2
–xy.

Answer 1

Answer:

1. 4A+2B-7 - (A-B+3A-2B+5) = 0A +5B -12

2. 3x-4y+7 -(3 ( 2x+y - 5 +x - 3y + 7x -4y +3 ) )

= 3x -4y + 7 - 6x - 3y +15 -3x +9y -21x + 12y +9

= -27x 14y + 31

3. 2x²+y² - (x²-y³) + 9x² - 3y² - xy

= x² + y² + 9x² -3y² - xy

= 10x² - xy -2y²