x2-9x+54 find the value of x
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the value of x
the question is x2-9+54
then x=
2x-9x+54
=-7x=54
x=-7+54
x=47
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x^2 - 9x +54
a=1 b=-9 c = 54
x= -b +or- √(b^2 -4ac)/2a
x= 9 +or- √((-9)^2 -4(1)(54))/2(1)
x= 9 +or- √(81 -216)/2
x= 9 +or- √((-135)/2
x= 9 +or- i√(135)/2
√135 = √(5×3×3×3) =3√(5×3) = 3√15
x= 9 +or- 3i√15/2
so x = 9+3i√15/2 , 9- 3i√15/2
a=1 b=-9 c = 54
x= -b +or- √(b^2 -4ac)/2a
x= 9 +or- √((-9)^2 -4(1)(54))/2(1)
x= 9 +or- √(81 -216)/2
x= 9 +or- √((-135)/2
x= 9 +or- i√(135)/2
√135 = √(5×3×3×3) =3√(5×3) = 3√15
x= 9 +or- 3i√15/2
so x = 9+3i√15/2 , 9- 3i√15/2
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