Q8 of 30 Page 242

If z = 10, find the value of z3 – 3(z – 10)

As z = 10


z3 - 3(z - 10)


= (10)3 - 3(10 - 10)


= 1000 - 3(0)


= 1000 - 0


= 1000


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6

Simplify the expressions and find the value if x is equal to 2

(i) x + 7 + 4(x-5)


(ii) 3(x+2) + 5x-7


(iii) 6x + 5(x-2)


(iv) 4(2x-1) + 3x +11

 7

Simplify these expressions and find their values, if x=3,a=-1,b=-2

(i) 3x – 5 – x + 9


(ii) 2 - 8x + 4x + 4


(iii) 3a + 5 - 8a + 1


(iv) 10 - 3b- 4 - 5b


(v) 2a - 2b – 4 – 5 + a

 9

If p = -10, find the value of p2 – 2p – 100

 10

What should be the value of a if the value of 2x2 + x - a equals to 5, when x = 0?