Ayúdenme plis es para el jueves : v?

A) <img src="https://tex.z-dn.net/?f=x%5E2%2B4x%2B3%3D0" />

<img src="https://tex.z-dn.net/?f=a%3D1%2C%5C%3Ab%3D4%2C%5C%3Ac%3D3" />

<img src="https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-4%2B%5Csqrt%7B4%5E2-4%5Ccdot%20%5C%3A1%5Ccdot%20%5C%3A3%7D%7D%7B2%5Ccdot%20%5C%3A1%7D%3D-1" />

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<img src="https://tex.z-dn.net/?f=x%3D-1%2C%5C%3Ax%3D-3" />

B) <img src="https://tex.z-dn.net/?f=2x%5E2-20%3D6x" />

<img src="https://tex.z-dn.net/?f=2x%5E2-20-6x%3D6x-6x" />

<img src="https://tex.z-dn.net/?f=2x%5E2-20-6x%3D0" />

<img src="https://tex.z-dn.net/?f=a%3D2%2C%5C%3Ab%3D-6%2C%5C%3Ac%3D-20" />

<img src="https://tex.z-dn.net/?f=x%3D%5Cfrac%7B-%5Cleft%28-6%5Cright%29%2B%5Csqrt%7B%5Cleft%28-6%5Cright%29%5E2-4%5Ccdot%20%5C%3A2%5Cleft%28-20%5Cright%29%7D%7D%7B2%5Ccdot%20%5C%3A2%7D%3D5" />

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C)[img = 12]

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D)[img = 19]

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E)[img = 24]

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F)[img = 29]

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