[" 69.If "b^(2)>4ac," then "a(x^(2)+4x+4)^(2)+b(x^(2)+4x+4)+c=0" has distinct root if "],[[" (A) "b

If b^(2)>4ac, then a(x^(2)+4x+4)^(2)+b(x^(2)+4x+4)+c=0 has distinct real roots if :

If b^2>4ac , then a(x^2 +4x+4)^2+b(x^2 +4x +4)+c=0 has distinct real roots if :

If b^(2)gt4ac then roots of equation ax^(4)+bx^(2)+c=0 are all real & distinct if :

The equation x^(4)-2x^(2)=a has 4 distinct real roots,then

If the equation x^(2) + 4x - k = 0 has real and distinct roots, then

If b^(2)>4ac then roots of equation ax^(4)+bx^(2)+c=0 are all real and distinct if: b 0b>0,a>0,c>0(d)b>0,a<0,c<0

The roots of the quadratic equation ax^(2) + bx + c = 0 (a ! = 0 ) are given x = (-b pm sqrt(b^(2) - 4ac))/(2a) are (i) real and distinct roots if D gt 0 (ii) repeated roots if D = 0 no real roots if D lt 0 , where D = b^(2) - 4ac The nature of the roots of quadratic equation 4x^(2) + 20x + 25 = 0 is

The equation x ^(4) -2x ^(3)-3x^2 + 4x -1=0 has four distinct real roots x _(1), x _(2), x _(3), x_(4) such that x _(1) lt x _(2) lt x _(3)lt x _(4) and product of two roots is unity, then : x _(1)x _(2) +x_(1)x_(3) + x_(2) x _(4) +x_(3) x _(4)=