Question

SOMEBODY HELP ME PLEASE

""What is wrong with the solution:

x(x+3)=9
x=9 or x+3=9
x=6

So, the roots are 6 & 9""

i dont understand 

Answer 1

Suppose \(x=9\) is a solution. Does the equation still hold?
\[9(9+3)=9~~?\]

Answer 2

The answer is no. You can only apply the step you used if the equation were equal to 0.

What you should have done:
\[x(x+3)-9=0\\
x^2+3x-9=0\]
Then find the roots by factoring or applying the quadratic formula.

Answer 3

using the zero product rule the function has to be equal to zero in order to solve
for example
x(x+3)=0
x=0 and x=-3
x(x+3)=9<----not equal to zero

Answer 4

Thank you to yall!!!!