If the cost price of 20 books is equal to the selling priceof 18 books, find the gain per cent
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f(t) = 4t2 – 3t + 6
(i) f(0) = 4(0)2 – 3(0) + 6
= 0 – 0 + 6 = 6
(ii) f(4) = 4(4)2 – 3(4) + 6
= 64 – 12 + 6 = 58
(iii) f(-5) = 4(-5)2 – 3(-5) + 6
= 100 + 15 + 6 = 121
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