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Sagot :

Bonjour

Factoriser 20xau carré +3-7x

= 20x^2 - 7x + 3

= (xV20)^2 - 2 * xV20 * 7/(2V20) + [7/(2V20)]^2 - [7/(2V20)]^2 + 3

= [xV20 - 7/(2V20)]^2 - 49/80 + 240/80

= [xV20 - 7/(2V20)]^2 + 191/80

On ne peut pas plus factoriser

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