Question

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

1

2

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Answer 1

Step-by-step explanation:

3×3 { 4×3 -5 } +3

9 { 12-5} +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