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a fost răspuns

Sa se calculeze:
a) (2√2-3a) (2√2+3a)
b)(x supra 3 +2y)³

Răspuns :

Renatemambouko
a) (2√2-3a) (2√2+3a) =8-9a²
formula (a+b)(a-b)=a²-b²

b)(x/3 +2y)³ =
=x³/27+ 3*x²/9*2y+3*x/3*4y²+8y³=
=x³/27+ 2x²y/3+4xy²+8y³
formula (a+b)³=a³+3a²b+3ab²+b³

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