Question 450009
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Hi
Using the Quadratic Formula to solve
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}
4x^2+15x+9=0   OR 4(x+15/8)^2 = 81/16  x = -15/8  ± 9/8  |Completing square
{{{x = (-15 +- sqrt( 81 ))/(8) }}}
   x = (-15 ± 9)/8  x = - 3 and x = -6/8 = -3/4
x^2-8x+16=0   OR (x-4)^2 = 0  x = 4  |Completing square
{{{x = (8 +- sqrt(0 ))/(2) }}}
   x = 4
x^2-2x-3=0  OR (x-3)(x+1) = 0  x = 3 and x = -1  |Factoring
{{{x = (2 +- sqrt( 16 ))/(2) }}}
   x = (2 ± 4)/2  x = 3 and x = -1