Question

please solve these two questions...
no spamming..
thanks​

Answer 1

Answer:

a)-4

b)7a+24

Step-by-step explanation:

a)n(x)=3x+12

given:n(a)=0

then 3a+12=0

        3a=-12

         a=-4

b)n(2/3a)+n(a)={3(2/3a)+12}+{3(a)+12}

                       =(2a+12)+(3a+12)

                        =5a+24