1. Which of these is NOT a quadratic equation? a. 4x-x^{2}=3
c. (n-1)(n+2)=5n
b. 2(y+3)=8
d. m(1-6m)=0

c.

step-by-step explanation:

because first you have to add the 4x, 9x, and the 7x together and you get 20x and then you add the last numbers up and you get 5and then you put the subtraction sign in there and that's how you get the answer.

-22

times both sides by 2, times () by 8, add alile terms, move terms, add alike and caculate divide both sides by 3

if you need just tell me and i will come to the rescue.

step-by-step explanation: