Question

17)Simplify:3x(4x – 5) + 3 and find its values for a)x = 3 b)x
2​

Answer 1

${\huge{\bigstar{\underbrace{Answer}}}}$

3x(4x-5)+3

=12x²-15+3

=12x²-12

a) Putting x=3

=> 12(3)²-12

=>(12×9)-12

=>109-12

=>96

b) Putting x=2

=> 12(2)²-12

=>(12×4)-12

=>48-12

=>36

I hope my answer helped you✌

Have a nice day☺️

Answer 2

Answer:

a)66

b)21

Step-by-step explanation:

3x(4x-5)+3

12x^2 -15x+3

12x^2-12x-3x+3 ( factorisation (

12x(x-1)-3(x-1)

taking x-1 common

(x-1)(12x-3)

a)x=3

(3-1)(36-3)

2(33)

66

b)x=2

(2-1)(24-3)

1(21)

21