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Recognise that quadratic can be factorised:

(x+4)(x-1)=0

This gives the solutions x=-4 and x=1 by inspection.

Moi, je fais de nombreux choses pour aider l’environnement. Premièrement, dans ma maison on recycle tout ; le papier, le verre, même les vêtements. Deuxiement, j’essaie toujours de me souvenir d’éteindre ...

English is quite different from most other subjects in that it is heavily source-based, both in one's understanding but also in the simple components to a question. I will separate this explanation into t...

Aerobic repiration produces ATP whilst recycling NAD. NAD recycling to NAD+ is important in glycolysis, an anaerobic respiratory process.

First Simplify the numbers we know. Therefore we get:       x²=75/3      which is the same as     x²=25

Now find the square root of 25, which is 5 or -5. Therefore x=5 or -5