how do you find the product of (9x-7)(9x+4) ?

Distribution is the property that allows us to multiply polynomials 

(9x-7)(9x+4)= 
9x(9x+4)-7(9x+4)= 
81x^2+36x-63x-28= 
81x^2-27x-28= 


:)

Evaluate (1+x)^2=

FOIL is really popular, but I prefer straight distribution: 
(1+x)^2= 
(1+x)(1+x)= 
1(1+x)+x(1+x)= 
1+x+x+x^2= 
1+2x+x^2 

:)

Multiply

Multiplying Binomials