Question

(a) Simplify 3x (4x - 5) + 3 and find its values for (i) x = 3 (ii) x=
½
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Answer 1

Answer:

3x(4x-5)+3

if x=3

3×3(4×3-5)+3

9(12-5)+3

9(7)+3

63+3

66

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