Question

What is the value of k if (3x – 4) (5x + 3) = 15x² -kx - 12 ?
1.3
2.-2
3.11
4.-11

Answer 1

Answer:

(3x-4) (5x+3)=15x^2-kx-12

=15x^2-20x+9x-12=15x^2-kx-12

= -20x+9x=-kx

= -x(20-9)= -kx

-kx

= (20-9) = ----------

-x

=11=k

=k=11

ans=k=11