x square-6x-18=0 find in 2 decimal places
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Step-by-step explanation:
- x² - 6x - 18 = 0
On comparing with ax² + bx + c = 0
- a = 1
- b = -6
- c = -18
- D = b² + 4ac
- D = (-6)² + 4*1*-18
- D = 36 + 72
- D = 108
The solutions are :-
- x = - b ± √D/2a
- x = -(-6) ± √108 / 2*1
- x = ( 6 ± 6 √3 )
- x = 3 ± 3√3
- x = [ 3 + 3(1.732) ] , [ 3 - 3(1.732) ]
- x = 8.19 , -2.19
:. The two solutions are :- 8.19 and -2. 19
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