jen18
jen18
08-07-2014
Mathematics
contestada
Please solve equation
-3x2+243=0
Respuesta :
Аноним
Аноним
08-07-2014
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.
Answer Link
Ryan2
Ryan2
08-07-2014
[tex]-3x^2+243=0\\ \\ -3x^2=-243\\ \\ x^2=\frac{-243}{-3}\\ \\ x^2=81\\ \\ x=\pm\sqrt{81}\\ \\ \boxed{x=\pm9}[/tex]
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