Special Product To Solve That Problem Could Be Either FOIL METHOD Or Pattern :)
FOIL METHOD :
(10x+3y)(10x-3y)
F- 100 x[tex] x^{2}[/tex]
O - -13xy
I - 13 xy
L- -9[tex] y^{2} [/tex]
Ans;
100[tex] x^{2} [/tex] + (-13+13)xy - 9[tex] y^{2} [/tex]
= 100[tex] x^{2} [/tex] - 9[tex] y^{2} [/tex]
PATTERN :
(10x+3y)(10x-3y)
[tex](10x) ^{2} [/tex] + (-3y+3y)10x - 9[tex] y^{2} [/tex]
== 100[tex] x^{2} [/tex] - 9[tex] y^{2} [/tex]
