[A+7= 28] is the correct equation I believe, though I may be wrong.
Answer:
The complete solution is
Step-by-step explanation:
Given differential equation is
3y"- 8y' - 3y =4
The trial solution is

Differentiating with respect to x

Again differentiating with respect to x

Putting the value of y, y' and y'' in left side of the differential equation


The auxiliary equation is




The complementary function is

y''= D², y' = D
The given differential equation is
(3D²-8D-3D)y =4
⇒(3D+1)(D-3)y =4
Since the linear operation is
L(D) ≡ (3D+1)(D-3)
For particular integral

[since
]
[ replace D by 0 , since L(0)≠0]

The complete solution is
y= C.F+P.I

Answer:
Just took the test and got the correct answer :)))
Step-by-step explanation:
Look at the image down below!!
Answer:
X=-6
Step-by-step explanation:
Subtract 9 on both sides
Add -9 and -15 You get -24
Divide -24 by 4 you get x=-6