13x = (85)2 – (84)2 then x = ……………….A) 16 B) 11 C) 13�

1.	13x = (85)2 – (84)2 then x = ……………….A) 16 B) 11 C) 13 D) 10
Answer» Correct option is C) 13 Correct option is (C) 13 \(85^2–84^2\) \(=(85-84)\times(85+84)\) \(=1\times169=169\) \(\therefore\) 13x = 169 \(\Rightarrow\) \(x=\frac{169}{13}=13\)

13x = (85)2 – (84)2 then x = ……………….A) 16 B) 11 C) 13 D) 10

Answer»

Correct option is C) 13

Correct option is (C) 13

\(85^2–84^2\) \(=(85-84)\times(85+84)\)

\(=1\times169=169\)

\(\therefore\) 13x = 169

\(\Rightarrow\) \(x=\frac{169}{13}=13\)