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(5x+2)la a 2. Ajutorr


Răspuns :

folosim formula (a+b)²=a²+2·a·b+b²
in acest caz:a=2x si b=2
(5x+2)²=5²x²+2·5x·2+2²=25x²+20x+4
(5x+2)²=(5x)²+2·5x·2+2²=25x²+20x+4