(a - 7)x² + 13x - a = 0 x₁ = 5 . Find x2 and a
I assume you mean x=5
x^2=25
(a-7)*25+13*5-a=0
25(a-7)+65-a=0
25a-175+65-a=0
24a=175-65
24a=110
a=110/24
and you can finish it :)
