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This was the easiest problem I could post and still only 60 % people could solve it . !!!! Amazing !!!!!!
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What do you think was the most incorrect answer that the 40% got wrong?
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Maybe ................... 9
9 × x = 8 1 Taking 9 out, 3 x = 8 1 x = 2 7 Squaring both the sides we get, x = 7 2 9
(9x)=81^2. or.x=(81/3)^2. or,x=27^2=729
9 * x=81 * 81
x=6561/9
x=81
This would mean that you need to calculate 8 1 2 then divide by 9 . Which is more work than needed.
\sqrt{9×x}=81 \Rightarrow 3×\sqrt{x}=81 \Rightarrow \sqrt{x}=27 \Rightarrow x=729 (squaring on both sides)
sqrt(9*x)=81
3*sqrt(x)=81
sqrt(x)=27
x=729
Since (9x)^1/2=81, then 9x=81^2=9^4. So x=(9^4)/9=9^3=729.
√9×x=81 Squaring both side 9×x=81×81 X=729
More common sense than math. I knew 3 x 27 = 81. So I just squared 27 to get 729.
Nice shortcut :)
whatever operation we do , we do on both the sides , so , we square on both the sides....
(9 x)^.5=81 squaring both side 9 x=81* 81 x=81* 81/9 x=81* 9 x=729
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9 × x = 8 1 9 × x = 8 1 2 x = 9 8 1 × 8 1 x = 7 2 9