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Barrelracing
 one year ago
Solve x2 + 2x + 9 = 0
A) X=2 + or  4i squareroot 2
b) x= 2 + or  2i squareroot 2
c) x= 1 + or  4i squareroot 2
d) x = 1 + or  2i squareroot 2
Barrelracing
 one year ago
Solve x2 + 2x + 9 = 0 A) X=2 + or  4i squareroot 2 b) x= 2 + or  2i squareroot 2 c) x= 1 + or  4i squareroot 2 d) x = 1 + or  2i squareroot 2

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anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[Given: x^2 + 2x + 9 = 0\\ as\ discriminant\ of\ this\ eq\, D= 2^24.1.9=436=32<0\\hence\ its\ roots\ are\ imaginary\\use\ quadratic\ formula\\x=\frac{ b \pm \sqrt{b^24ac} }{ 2a }\\ here\ a=1,\ b=2,\ c=9\\we\ have\ x=\frac{ 2 \pm \sqrt{2^24.1.9} }{ 2.1 }\\x=\frac{ 2 \pm \sqrt{436} }{ 2}\\x=\frac{ 2 \pm \sqrt{32} }{ 2}\\x=\frac{ 2 \pm \sqrt{2.i^2.4.4} }{ 2}\\x=\frac{ 2 \pm i4\sqrt{2} }{ 2 }\\x=1\pm\ i2\sqrt{2}\]

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0@Barrelracing option d correct
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