Question

Determinati x € R , stiind ca
$(x + 1 {) }^{2} = {x}^{2} + x + 8$
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Answer 1

Explicație pas cu pas:

x²+2x+1=x²+x+8 => 2x+1=x+8 => x=7

Answer 2

$\it (x+1)^2=x^2+x+8 \Rightarrow (x+1)^2 =x(x+1) +8 \Rightarrow (x+1)^2-x(x+1)=8 \Rightarrow\\ \\ \Rightarrow (x+1)(x+1-x)=8 \Rightarrow x+1=8 \Rightarrow x=7$