Find f(7). f(x)=x^2+9

find b(-2)-a(12). a(x)=13x-2; b(x)=8x-14

Step-by-step explanation:

f(7). f(x)=x^2+9

Put x = 7 in the equation

f(7) = 7^2 + 9 =58

Find b(-2)-a(12)

b(-2)=8x-14= -16-14=-30

a(x)=13x-2

a(12) =13×12 -2= 154

b(-2)-a(12) = -30-154

= -124

answer: 12,000

step-by-step explanation: first you ar e supposed to add. then multiply then subtract