$(99{)}^2=(99)^2\; =$ ............

9.8 $\times \backslash times$ 10.2 = ………

$(84{)}^2-(16{)}^2=(84)^2\; -\; (16)^2\; =$ .........

1010 $\times \backslash times$ 990 = …………

$(705{)}^2-(295{)}^2=(705)^2\; -\; (295)^2\; =$ ............

$(x+1)(x-1)(x^2+1)=(x\; +\; 1)\; (x\; -\; 1)\; (x^2\; +\; 1)\; =$ ..........

$8x=(52{)}^2-(48{)}^{2}8x\; =\; (52)^2\; -\; (48)^2$ then x = .........

$13x=(85{)}^2-(84{)}^{2}13x\; =\; (85)^2\; -\; (84)^2$ then x =  .........

(11 + x) (11 – x) = ………

$11^{3}11^3$ = ……………