I did my math and I think 41 minuets but are u adding or subracting
-1 3/10 is the correct answer
Answer:
(f+g)(x) = 4 x^2 + (3/2) x - 7
Answer (c) on your list
Step-by-step explanation:
f+g (x) = f(x) + g(x) = x/2 - 3 + 4 x^2 + x - 4
combine the terms in "x" = x/2 + x = (3/2)x
combine the numerical terms: - 3 - 4 = - 7
Then the final expression is:
(f+g)(x) = 4 x^2 + (3/2) x - 7
Cramer's rule works as follows:
x+3y=16
3x+y=8
Then
x=Dx/D
y=Dy/D
where Dx,Dy,D are 2x2 matrices formed from of coefficients and right hand side.
D=
1 3
3 1
=1-9=-8
Dx=matrix D with first column replaced by the vector [16,8]=
16,3
8 1
=16-24
=-8
Dy=matrix D with second column replaced by the vector [16,8]=
1 16
3 8
=8-48
=-40
Therefore
x=-8/-8=1
y=--40/-8=5
Check:
x+3y=1+3(5)=16
3x+y=3(1)+5=8 ok.
