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Question

Question 4(a)
Simplify : 3x (4x-5) +3 and find values for (i) x=3 (ii) x= 12

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Solution

3x(4x5)+3=3x×4x3x×5+3=12x215x+3
(i) For x=3,
12x2+15x+3=12(3)215×3+3
=12×945+3=10845+3=66
(ii) For x=12
12x215x+3=12×(12)215×12+3=12×14152+3
=6152=12152=32


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