In the expansion (ax+by)^7, the coefficients of the first two terms are 128 and -224, respectively. Find the values of a and b

a = 2, b = 3.5

Step-by-step explanation:

Expanding using Binomial expansion, we have that:

=

We have that the coefficients of the first two terms are 128 and -224.

For the first term:

=>

=>

For the second term:

Therefore, a = 2, b = 3.5

what is the model?

step-by-step explanation: