Question

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

Explicación paso a paso:

(a+b)³=a³+3a²b+3ab²+b³

x³+3x²+3x+1-(x³-3x²+3x-1)=7x

x³+3x²+3x+1 -x³+3x²-3x+1=7x

Se eliminan semejantes

6x²+2=7x

6x²-7x+2=0 Factorizar

(3x-1)(2x-2)=0

3x-1=0

3x=1

x1=1/3

2x-2=0

2x=2

x=2/2

x2=1