Question

(iii) The coefficient of xyz in - xyz is -1.
(iv) The coefficient of b in -abc is -ac.
EXERCISES
1. If a = 2 and b = 3, find the value of
(i) a + b
(ii) a² + ab
(iv) 2a – 3b
(v) 5a² - 2ab
2. If x = 1, y = 2 and z = 5, find the value of
(i) 3x – 2y + 4z
(ii) x² + y2 + z2
(iv) xy + yz - 2x
(v) 2x”y - 5yz +.
3. If p = -2, q = -1 and r = 3, find the value of​

Answer 1

Answer:

1.(i)(2a-3b)

2.(iv)(xy+yz-2x)

3.(iv)the coefficient of B in - abc is- ac

Answer 2

1) a. a+b
= 2+3
=5

b. a² + ab
= 2² + 2×3
= 10

c. 2a-3b
= 4-9
= -5

d. 5a²- 2ab
= 20- 12
=9

2a. 3x + 2y + 4z
=3 + 4 + 20
= 27

b. x² +y²+z²
= 1+2+25
=28

c. xy + yz -2x
= 2+10-2
=6