Question 901008
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Hi
1x^2 + 2x – 25 = 0   |Format ax^2 + bx + c
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}}  |Substitute: a = 1, b = 2, c = -25
{{{x = (-2 +- sqrt( 4+ 100 ))/(2) }}}  |Follow thru to the finish!
{{{x = (-2 +- sqrt( 104 ))/(2) }}}
{{{x = (-2 +- sqrt(4*26 ))/(2) }}}
{{{x = (-2 +- 2sqrt(26 ))/(2) }}}
{{{x = -1 +- sqrt(26)}}}