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Simplify 3x(4x - 5) + 3 and find its values for (i) x = 3

Q : 4         (a)    Simplify  3x(4x-5)+3  and find its values for

                           (i) \small x=3

Answers (1)
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(a)  We have 

                           3x(4x-5)+3 = 12x^2 - 15x + 3

Put x = 3,

We get :              12(3)^2 - 15(3) + 3 = 12(9) - 45 + 3 = 108 - 42 = 66

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