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Andreyy89
3 years ago
14

Please solve equation -3x2+243=0

Mathematics
2 answers:
blsea [12.9K]3 years ago
5 0
-3x^2+243=0\\
\\
-3x^2=-243\\
\\
x^2=\frac{-243}{-3}\\
\\
x^2=81\\
\\
x=\pm\sqrt{81}\\
\\
\boxed{x=\pm9}
Illusion [34]3 years ago
3 0
Answer is 9.

-3x^2 + 243 = 0
Bring 243 to the right.
-3x^2 = -243
Divide by -3.
x^2 = 243/3 = 81
Tak the square root of both sides.
x = 81^1/2 = 9.
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