Решите уравнение 8-х=√13х+10

Question

Решите уравнение
8-х=√13х+10

Answer 1

(8-x)^2=√13х^2+10^2
64-8x+x^2=13x+10
x^2-21x+54=0
Д=b^2-4ac=441-216=225 √Д=15
x1,2=(-b+-√Д)/2a
x1=(21+15)/2=18
x2=(21-15)/2=3

Answer 2

64-16x+x²=13x+10
x²-16x-13x+64-10=0
x²-29x+54=0
D=841-216=625
x1= (29-25)/2=2
x2=(29+25)/2=27