Dragomirandreeaask
a fost răspuns

Calculati:
a) (2x-5)²+(4x+3)²-(7x-2)(7x+2)
b) (3-2a)²-(4a-1)²+(4a-5)(4a+5)

Răspuns :

Alexutza2000ask
Ai facut formulele de calcul prescurtat????
a.(2x-5)²+(4x+3)²-(7x-2)(7x+2)=4x²-20x+25+16x²+24x+9-49x²+4=20x²+44x+38-49x²=44x+38-29x²
b.(3-2a)²-(4a-1)²+(4a-5)(4a+5)=9-12a+4a²-16a²+8a-1+16a²-25=20a+4a²-17

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