Question

F(x)=x^2+3x ... find f(2-a)

Answer 1

(2-a)^2 + 3(2-a)




A^2 -2a + 4 + 6 -3a



A^2 -5a +10

Answer 2

f(x) = x^2 + 3x

Replace x with (2 - a).

f(2 - a) = (2 - a)^2 + 3(2 - a)

f(2 - a) = 4 - 4a + a^2 + 6 - 3a

f(2 - a) = a^2 - 7a + 10