Saved Bookmarks
| 1. |
7. a (3a - 2) - 18. a b9. 3-a (4 + 7a)10. (2a + b)2 - 6a - 36 - 411. 1 - 2a - 2b - 3 (a + b)212. 3a2 - 1-2a13 2 + 3x + 2 + ax + 2a |
|
Answer» Answer: ANSWER: (i) 5x + 7x + (-6x) = 5x + 7x -6x = 6x (ii)
5
x + 2 3
x + -4 5
x= 9x +10x -12x 15
= 7x 15
(iii) 5a2b +( −8a2b) + 7a2b = 5a2b − 8a2b + 7a2b 4a2b (iv)
3 4
x2 + 5x2+ (-3x2 ) + (- 1 4
x2)= 3 4
x2 - 1 4
x2 + 5x2-3x2= 1 2
x2 + 2x2 = 5 2
x2 (v) Collecting like terms and adding them: x − 3y + 4z + y − 2x − 8z + 5x − 2y − 3z = x- 2x + 5x - 3y + y - 2y + 4z - 8z - 3z = 4x -4y -7Z (vi) Collecting like terms and adding them: 2x2 − 3y2 + 5x2 + 6y2 + (− 3x2 − 4y2) = 2x2 + 5x2 - 3x2 - 3y2 +6y2 -4y2= 4x2 -y2 (vii) Collecting like terms and adding them: 5x − 2x2 − 8 + 8x2 − 7x − 9 + 3 + 7x2 − 2x = -2x2 +8x2 + 7x2 + 5x - 7x - 2x -8 -9 + 3= 13x2 -4x -14 (VIII) Collecting like terms and adding them: 2 3
a- 4 5
b+ 3 5
c +(- 3 4
a - 5 2
b+ 2 3
c )+ 5 2
a+ 7 4
b- 5 6
c b - 5 2
b + 7 4
b + 3 5
c + 2 3
c - 5 6
c = (8 -9 +30)a 12
+ (-16 - 50 +35)b 20
+ (18 +20 -25)c 30
= 29 12
a - 31 20
b + 13 30
c (ix) Collecting like terms and adding them: 8 5
x+ 11 7
y+ 9 4
xy + (- 3 2
x- 5 3
y- 9 5
xy)= 8 5
x - 3 2
x+ 11 7
y - 5 3
y + 9 4
xy - 9 5
xy = 1 10
x - 2 21
y + 9 20
xy |
|