Which of the following expressions is difference of two squares?
A. x – 9 B. 𝑥
2 −
1
9
C. x2 + 9 D. x + 9 E. x2
– 9x
5𝑥4×2𝑥3
$\sqrt{\Box}$ 20 + $\sqrt{\Box}$ 45 + $\sqrt{\Box}$ 125 +
2$\sqrt{\Box}$ 180
(4(5^(2n+1))-10(5^(2n-1)))/(2(5^(2n)))
80100.(231000.x+432000)=1602000
5/100.(231000x.432000)=1602000
1 1/3 -2
(pifthenq)ifandonlyif~pifthenq
12/7 * 1 1/6
58500.(231000.x+432000)=1602000