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(2x-5) la puterea 2 +3(x-2)(x+2)-(x+4) la puterea 2

Răspuns :

4x^2-20x+25+3x-6+3x+12+x^2+8x+16=
3x^2-25x+3
(2x-5) la puterea 2 +3(x-2)(x+2)-(x+4) la puterea 2=
4x
²-20x+25+3(x²-4) - (x²+8x+16) =
4x²- 20x+25+3x²- 12 - x² - 8x - 16 = 6x² - 28x - 3