Ok, I love doing these because they're very simple.
F=flour C=corn
m=mild d=medium s=spicy p=pico
c=cheddar j=monterey jack
Fmc
Fmj
Fdc
Fdj
Fsc
Fsj
Fpc
Fpj
8 Flour, which means 8 corn. So that means there are 16 different tacos.
Can you take the quantity [ x + y ] and square it ?
Can you take the quantity [ x + 2y ] and square it ?
Then you should have no trouble with the square of (.9x + .8y) .
The square of any binomial (expression with 2 terms) is
(square of the first term)
+ (square of the second term)
+ 2 times (product of the terms) .
