Question

03= Resolva a cada uma das equações do 2° grau e indique as raizes

A)225–X²=0
B)X²–10=0
C)121–4x²=0
D)X²–8=0
E)100–0,01x²=0
F)900–x²=0​

Answer 1

Resposta:

tô em duvida tambem dessa

Answer 2

Resposta:

$A)\\ 225-x^2=0\\ \\ -x^2=-225~~~\times(-1)\\ \\ x^2=225\\ \\ x=\pm\sqrt{225} \\ \\ x=\pm15$

S={ -15 , +15}

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$B)\\ x^2-10=0\\ \\ x^2=10\\ \\ x=\pm\sqrt{10}$

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$C)\\ 121-x^2=0\\ \\ -x^2=-121\\ \\ x^2=121\\ \\ x=\pm\sqrt{121} \\ \\ x=\pm11$

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$D)\\ x^2=8\\ \\ x=\pm\sqrt{8} \\ \\ x=\pm2\sqrt{2}$

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$E)\\ 100-0,01x^2=0\\ \\ -0,01x^2=-100\\ \\ x^2={-100\over-0,01}\\ \\ x^2=10.000\\ \\ x=\pm\sqrt{10.000} \\ \\ x=\pm100$

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$F)\\ 900-x^2=0\\ \\ -x^2=-900\\ \\ x^2=900\\ \\ x=\pm\sqrt{900} \\ \\ x=\pm30$