Question

explain the answer properly.​

Answer 1

Answer:

(d) -12

Step-by-step explanation:

-$-x^{2} +3x-a=8\\-(-1)^{2} +3(-1)-a=8\\-(1)-3-a = 8\\-4-a = 8\\-4-8=a\\-12=a$

therefore a = -12