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CALCULATI. (4x+5)²-(√5x+4)(4-√5x)=

Răspuns :

16x la 2 + 40x + 25 -( 4 radical 5 -5 +16 - 4 radical 5)
16x la 2 + 40x + 25 - 11
16x la 2 + 40x + 14

16x^2+40x+25-16+5x^2=
21x^2+40x+9