Question

Nature nature of the roots of the equation X square + 2 X + 4 equal to

Answer 1

checking by the determinant

b²-4ac = 4 -4(1)(4)

= 4-16 = -12

since -12<0 .

so roots do not exists ....

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Answer 2

D =

b2-4ac

2*2-4*1*4

4-16

-4

therefore no real roots ..

Answer 3

Answer:

D=b²-4ac.

x²+2x+4=0

D=(2)²-4

D=4-4

D=0

Roots are real and equal