Bonjour,
f(x) = 25x²+20x+4-(5x+2)(x+6)
= (5x+2)² -(5x+2)(x+6)
= (5x+2)(5x+2)-(5x+2)(x+6)
= (5x+2)[(5x+2)-(x+6)]
= (5x+2)(4x-4)
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Bonjour,
f(x) = 25x²+20x+4-(5x+2)(x+6)
= (5x+2)² -(5x+2)(x+6)
= (5x+2)(5x+2)-(5x+2)(x+6)
= (5x+2)[(5x+2)-(x+6)]
= (5x+2)(4x-4)