bonjour pouvez vous m'aidez s'il vous plait, je suis en 3e

Factoriser les expressions suivantes :
a) x²−14x+49=…..² - 2×….×…..+……² = (……. - ………)²
b) x²+12x+36=…..² + 2×….×…..+……² = (…….+………)²
c) x²+10x+25= (……….+ ……..)²
d) 9x²+12x+4 =…..² + 2×….×…..+……² = (…….+………)²
e) 1−14x+49x² = (……………….)²
f) 16x²+9−24x= (……………….)²
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