bjr
si je te dis que f(x) = (3x)² - (5x-3)² çà t'aide ?
pense à a² - b² = (a+b) (a-b)
donc
f(x) = (3x + (5x-3)) (3x - (5x-3))
f(x) = (8x-3) (-2x + 3)
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bjr
si je te dis que f(x) = (3x)² - (5x-3)² çà t'aide ?
pense à a² - b² = (a+b) (a-b)
donc
f(x) = (3x + (5x-3)) (3x - (5x-3))
f(x) = (8x-3) (-2x + 3)