Question 321243
1. (2x² + 3x – 1) + (5x² - 5x – 5)
7x^2-2x-6
{{{x = (-b +- sqrt( b^2-4*a*c ))/(2*a) }}} 
x=(2+-sqrt[2^2-4*7*-6])/2*7
x=(2+-sqrt4+168])/14
x=(2+-sqrt172)/14
x=(2+-13.115)/14
x=(2+13.115)/14
x=15.115/14
x=1.08 ans.
x=(2-13.115)/2
x=-11.115/14
x=-.8 ans.