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Q.

How do you factor and solve x2 – 18x + 27 = 0?

Class:  9

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a

6  

b

9+3 6  and 9−3 6  

c

7  

d

9   

answer is B.

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Detailed Solution

We have equation x2 - 18x + 27 = 0
by using quadratic formula
x= −b± b 2 −4ac 2a  
x= −(−18)± (−18) 2 −4×1×27 2×1  
x= 18±6 6 2  
x=9+3 6  and x=9−3 6  

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