Даю последние балы, помогите пожалуйста ㅠ_ㅠ

Решите уравнения с помощью теоремы Виета:

а) x²-9x+20=0
b) x²+x-56=0
e) 2x²-10x+12=0
c) x²+16x+63=0
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