Bonjour
factoriser cette expression :
A (x) = 4x²-20x+21A = (2x)^2 - 2 * 2x * 5 + 5^2 - 5^2 + 21A = (2x - 5)^2 - 25 + 21
A = (2x - 5)^2 - 4
A = (2x - 5)^2 - 2^2
A = (2x - 5 - 2)(2x - 5 + 2)
A = (2x - 7)(2x - 3)
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Bonjour
factoriser cette expression :
A (x) = 4x²-20x+21
A = (2x)^2 - 2 * 2x * 5 + 5^2 - 5^2 + 21
A = (2x - 5)^2 - 25 + 21
A = (2x - 5)^2 - 4
A = (2x - 5)^2 - 2^2
A = (2x - 5 - 2)(2x - 5 + 2)
A = (2x - 7)(2x - 3)