Question

$(x + 1) {}^{2} - (x - 3)(x + 3) = 7$
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Answer 1

Ответ:

(x+1)²-(x-3)(x+3)=7

x²+2x+1-(x²-9)=7

x²+2x+1-x²+9=7

2x+10=7

2x=7-10

2x= -3

x= -3/2= -1 1/2

x= - 1,5