Question

The number of terms in the expansion (3x+5y-7z+4t)^10 is

Answer 1

Step-by-step explanation:

x²+19x+18

We have to find two numbers whose sum is 19 and product is 18*1= 18.Clearly those numbers are 18 and 1.

x²+19x+18

x²+18x+x+18

x(x+18)+1(x+18)

(x+18)(x+1)