plz help fast plz plz plz
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Step-by-step explanation:
a) (2x+3y)²
= 4x²+12xy+9y²
b) (3a-2b+4c)²
= 9a²+4b²+16c²-12ab-16bc+24ca
c) (x+5)(x-3)
= x²+2x-15
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