Question

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1).Expand the following brackets:(4 marks)
a)3r(4s -1) b) 7( 2a - 3b + 4c)


2).Expand and simplify the following:(6 marks)
a) x(a - 2b) + 3a (3x + b) b) 3a +2b + 2( a + 4b)


3) Given that x =2, y = 5 and z= 7 evaluate the following: (6 marks)

10x - 2y + 6z b) 2z + xzxz

4) Given that x = 2, y = - 4 and z = - 2 work out a value for the following:(6 marks)

2x + 6y - 2z b) 5xy- 4z

Answer 1

Answer:

3)a)52 and b)210 .4) a)-24,b)-32

Explanation:

3) show X=2, Y=5,z=7. a)10x-2y+6y=10×2-2×5+6×7=20-10+42=10+42=52. b)2z+ xzxz=2×7+2×7×2×7=14+14×14=14+196=210

4) show X=2 ,y=-4 ,z=-2 a)2x+6y-2z=2×2+6×-4-2×2=4-24+4=-24 . b)5xy-4z= 5×2×-4-4×-2=10-4-4×-2=-40+8=-32

Answer 2

Answer:

1.a. 12rs-3r

b. 14a-21b+28c

2.a. ax-2bx+9ax+3ab=10ax-2bx+3ab

b. 3a+2b+2a+4b=5a+10b

Explanation:

3.a. 1×2-2×5+6×7

=20-10+42=52

b. 2×7+2×7×2×7

=14+196=210

4. a. 2×2+6×-4-2×-2

=4-24+4=(-16)

5×2×-4 - 4×-2

= -40+8=(-32)

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