Решите плизз!!!!!!!!!!!!!!!!!!!!!!!!

Question

Решите плизз!!!!!!!!!!!!!!!!!!!!!!!!

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Answer 1

5x^2+x=22
x=-1±√1^2-4×5×-22/2×5
x=-1±√1-20×-22/2×5
x-1±√1+440/2×5
x=-1±√441/2*5
x=-1±21/2*5
x=-1±21/10
x=-1+21/10
x=-1-21/10
x=20/10
x=-1-21/10
x=2
x=-1-21/10
x=2
x=-22/10
x=2
x=-22/10
x=2
x=-11/5
x∈-11/5,2