Question

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

Answer 1

3x ( 4x - 5 ) + 3

Equation :- 12x² - 15x + 3

• At x = 3

12 ( 3 ) ² - 15 x 3 + 3

12 x 9 - 15 x 3 + 3

108 - 45 + 3

Answer :- 66

• At x = ½

12 ( ½ ) ² - 15 x ½ + 3

12 x ¼ - 15 x ½ + 3

3 - 15/2 + 3

( 6 - 15 + 6 ) / 2

( 12 - 15 ) / 2

Answer :- ( - 3 / 2 )

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