Question

Simplify 3x (4x – 5) + 3 and find its values for (i) x = 3 (ii) x = ½​

Answer 1

Answer :-

(i) 3x (4x-5) + 3

Placing value of x = 3

3 × 3 (4 × 3 - 5) + 3

9 (12-5) + 3

9 × 7 + 3

63 + 3

66 ... Ans

(ii) 3x (4x – 5) + 3

Placing value of x = 1/2

3 × 1/2 (4 × 1/2 - 5) + 3

3/2 ( 2 × 1 - 5) + 3

3/2 (-3) + 3

-9/2 + 3

L.C.M = 6

-27 + 6 /6

-21/6

-3 + 3/6 ...Ans

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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