Page 171 - Math Grade 11 (Basic)

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j (X) = ( 10 - 2x) X X
3
= 4x - 40i + lOOx

[tl rn o < x < 5

2
f'(x) = 12x - 80x + 100
f'(x) = o n.pun&n 12i- sox+ too = o

3i- 20x + 25 = 0

2 2
11 = 20 -4(3)(25) = 100 = 10 5
X 0
20 - 10 5 x = 20 + 10 =
XI= -6- = 3 ' 2 6 5 +

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= ( 10 2 X ~) 2 X ~ = 2000
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