Question

If (2x+3) (5x-7)=10x²-kx-21,then the value of k

Answer 1

Answer:

K= -1

Step-by-step explanation:

=> (2x+3)(5x-7) = 10x²-kx-21

=> 10x²-14x+15x-21 = 10x²-kx-21

=> 1x = -kx cancelling 10x² and -21 which is

common on both sides

=> 1 = -k cancelling x on both sides

k = -1