Question

simplify 3x(4x-5)+3 and find its value for (a) x=2 (b) x=3​

Answer 1

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

$= 12 {x}^{2} - 15x + 3$

(a) When x = 2,

$12 {(2)}^{2} - 15(2) + 3$

$= 12(4) - 30 + 3$

$= 48 - 30 + 3$

$= 21$

(b) When x = 3,

$12 {(3)}^{2} - 15(3) + 3$

$= 12(9) - 45 + 3$

$= 108 - 45 + 3$

$= 66$

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