x²-7x+18=0 solve using quadratic formula
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x²-7x+18=0
on comparing this eq with standard form of quadratic equation ax²+bx+c=0
we get
a= 1 , b = -7 and c= 18
D= b²-4ac = 49 - 4×18 = 49-72 = 23
x= -b +-√D /2a = 7 +- √23 /2 = 7+- 4.79 /2
when +
x= 7+4.79/2 = 11.79/2
when -
x= 7-4.79/2 = 3.79/2
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Answer:
3.79/2
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