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SashulF [63]
3 years ago
15

The product of three and a squared number is twice the sum of the number and four

Mathematics
2 answers:
Mamont248 [21]3 years ago
7 0
From the text of the task we can write the equation:


3 x^{2} =2(x+4)\\
\\
3x^2=2x+8\\
\\
3x^2-2x-8=0\\
\\
\Delta=(-2)^2-4.3.(-8)=4+96=100\\
\\
x=\frac{2 \pm\sqrt{100}}{2.3}=\frac{2 \pm10}{6}\\
\\
x_1=\frac{2-10}{6}=-\frac{8}{6}=-\frac{4}{3}\\
\\
x_2=\frac{2+10}{2.3}=\frac{12}{6}=2
iris [78.8K]3 years ago
3 0
3x^2=2(x+4)\\
3x^2=2x+8\\
3x^2-2x-8=0\\
3x^2-6x+4x-8=0\\
3x(x-2)+4(x-2)=0\\
(3x+4)(x-2)=0\\
x=-\frac{4}{3} \vee x=2
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