Algebraic Expression Quiz 8

$(99)^2 =$ ............

9.8 $\times$ 10.2 = ………

$(84)^2 - (16)^2 =$ .........

1010 $\times$ 990 = …………

$(705)^2 - (295)^2 =$ ............

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

$8x = (52)^2 - (48)^2$ then x = .........

$13x = (85)^2 - (84)^2$ then x =  .........

(11 + x) (11 – x) = ………

$11^3$ = ……………