a(a + 1) = 6 then a = ………

$a^2+b^2+c^2+2ab+2bc+2ca=a^2+b^2+c^2+2ab+2bc+2ca=$ ..........

$196^2-(194+2{)}^2=196^2\; -\; (194\; +\; 2)^2\; =$ ...........

9672 = …………

The area of adjacent square is …

a (a – b) + b (a – b) = ………

$a^2-b^{2}a^2-b^2$ = (a + b) (a – b) is a ……

(x + a) (x – b) = …………

$101^2-101^2=101^2\; -\; 101^2=$ ............

a = 13, b = 12 then $a^2-b^{2}a^2-b^2$ = …………