Question

6.Simplify 3x(4x-5) +3 and find its values for (a) x=3 (b) x=0

Answer 1

Answer:

f(x)=3x(4x-5)+3

f(3)=3*3(4*3-5)+3

=9(7)+3

=63+3=66

f(0)=3

Answer 2

:

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3x(4x−5)+3=12x^2−15x+3

x=3 gives the value 12(9)−15×3+3

                             =108−45+3

                              =66

x=1/2 gives the value 12(1/4)−15×(1/2)+3

                             =3−7.5+3

                              = - 3/2