Edi's answer to Andrew's Secondary 4 A Maths Singapore question.
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
hope this helps
Date Posted:
1 year ago
How was the 2 equations obtained? The one after inspection
By using inspection,
We have to collect the like terms.
In this case, we will sum the coefficient of e^kx first, giving A+2K.
After that, we will sum the other pair, the coefficient of xe^kx, giving AK+6A.
So, for that equation to equate to zero, the sum of the coefficients of e^kx and xe^kx have to be equal to zero.
We have to collect the like terms.
In this case, we will sum the coefficient of e^kx first, giving A+2K.
After that, we will sum the other pair, the coefficient of xe^kx, giving AK+6A.
So, for that equation to equate to zero, the sum of the coefficients of e^kx and xe^kx have to be equal to zero.
Sorry I still don't understand
What sum do you mean?
I get the separation into like terms, but I don't see why the coefficients sums have anything to do with 0.
Is there another example to illustrate
What sum do you mean?
I get the separation into like terms, but I don't see why the coefficients sums have anything to do with 0.
Is there another example to illustrate
360 Tutoring Program