Решите приведенное квадратное уравнение:

1) x² + 4x-5=0; 3) x²-8x-9=0; 5) x² + x-6= 0;
2) x² - 6x-7= 0; 4) x² +6x-40=0; 6) x²-x-2=0.

по теореме Виета​
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