решите уравнение (x+2)^2+x=(x-4)(x+4). Created by the76. algebra-ru

решите уравнение (x+2)^2+x=(x-4)(x+4)...

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решите уравнение (x+2)^2+x=(x-4)(x+4)

rubilovalex

x^2+4x+4+x=x^2-16; x^2+5x+4-x^2= -16; 5x= -16-4; 5x= -20; x=(-20)/5= -4. Ответ: x= -4. x^2-14x+49+9x=x^2-16; x^2-5x-x^2= -16-49; -5x= -65; =(-65)/(-5)=13. Ответ: x=13.

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sophiamiii86 (x+2)^2 + x = (x - 4) ( x + 4)
x^2 + 2•x•2 + 4 + x = x^2 - 16
x^2 + 4x + 4 + x -x^2 = -16
5x = -16 -4
5x = -20
x = -20 : 5
x = -4

1 votes Thanks 1

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