Question

What are the roots of the equation? 18x^2-9x-1=0 18x 2 −9x−1=0

Answer 1

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USING FORMULAE " B^2 - 4ac

(-9)^2 - 4(18)(-9) = 0

81 + 648 > 0

729 > 0

ROOTS ARE REAL AND UNEQUAL

Answer 2

Answer:

Given, 18x² - 9x -1=0

on comparing with ax²+bx+c=0 we get

a=18 , b= -9 and c= -1

now, apply formula D = b²-4ac

D = (-9)² - 4(18)(-1)

= 81 + 72

= 153

So, here D > 0

=> Roots are real and unequal