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1. phân tích các biểu thức sau thành bình phương của 1 tổng.
a,\(4a^2+1bxa+16x^2\)
b,\(32x^2+32x+8\)
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a: \(16x^2+16xa+4a^2=\left(4x+2a\right)^2\)
b: \(=8\left(4x^2+4x+1\right)=8\left(2x+1\right)^2\)
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\(x^4-16x^2+32x-16=0\)
\(\Leftrightarrow x^4-2x^3+2x^3-4x^2-12x^2+24x+8x-16=0\)
\(\Leftrightarrow x^3\left(x-2\right)+2x^2\left(x-2\right)-12x\left(x-2\right)+8\left(x-2\right)\)
\(\Leftrightarrow\left(x-2\right)\left(x^3+2x^2-12x+8\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left(x^3-2x^2+4x^2-8x^2-4x+8\right)=0\)
\(\Leftrightarrow\left(x-2\right)\left[x^2\left(x-2\right)+4x\left(x-2\right)-4\left(x-2\right)\right]=0\)
\(\Leftrightarrow\left(x-2\right)^2\left(x^2+4x-4\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=2\\x=-2+2\sqrt{2}\\x=-2-2\sqrt{2}\end{matrix}\right.\)
Vậy.............
\(x^4-16x^2+32x-16=0\)
\(\Leftrightarrow x^4-16\left(x^2-2x+1\right)=0\)
\(\Leftrightarrow x^4-16\left(x-1\right)^2=0\)
\(\Leftrightarrow x^4-\left(4\left(x-1\right)\right)^2=0\)
\(\Leftrightarrow\left(x^2-4\left(x-1\right)\right).\left(x^2+4\left(x-1\right)\right)=0\)
\(\Leftrightarrow\left(x^2-4x+4\right).\left(x^2+4x-4\right)=0\)
\(\Leftrightarrow\left(x-2\right)^2.\left(x^2+4x-4\right)=0\)
\(\Leftrightarrow\)\(\left(x-2\right)^2=0\) hoặc \(x^2+4x-4=0\)
1) \(\left(x-2\right)^2=0\Leftrightarrow x-2=0\Leftrightarrow x=2\)
\(2\)) \(x^2+4x-4=0\Leftrightarrow x^2+4x+4-8=0\)
\(\Leftrightarrow\left(x+2\right)^2=8\)
\(\Leftrightarrow x+2=\sqrt{8}\) hoặc \(x+2=-\sqrt{8}\)
\(\Leftrightarrow x=\sqrt{8}-2\) \(x=-\sqrt{8}-2\)
Vậy tập nghiệm của phương trình là \(S=\left\{2;\sqrt{8}-2;-\sqrt{8}-2\right\}\)
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tham khảo tại đây nhé:
https://hoc24.vn/hoi-dap/question/578694.html