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Simplify the following:

[tex]\[ 2x^2 - 4x + 5 - \frac{1}{3}(x^2 - 5x + 7) \][/tex]

Sagot :

To simplify the given expression [tex]\(2x^2 - 4x + 5 - \frac{1}{3}(x^2 - 5x + 7)\)[/tex], follow these steps:

1. Distribute the [tex]\(\frac{1}{3}\)[/tex] across the terms inside the parenthesis:
[tex]\[ \frac{1}{3}(x^2 - 5x + 7) = \frac{1}{3}x^2 - \frac{5}{3}x + \frac{7}{3} \][/tex]

2. Rewrite the expression by including the distributed terms:
[tex]\[ 2x^2 - 4x + 5 - \left( \frac{1}{3}x^2 - \frac{5}{3}x + \frac{7}{3} \right) \][/tex]

3. Distribute the negative sign across the terms inside the parenthesis:
[tex]\[ 2x^2 - 4x + 5 - \frac{1}{3}x^2 + \frac{5}{3}x - \frac{7}{3} \][/tex]

4. Combine like terms:

- For [tex]\(x^2\)[/tex] terms:
[tex]\[ 2x^2 - \frac{1}{3}x^2 = \left(2 - \frac{1}{3}\right)x^2 = \frac{6}{3}x^2 - \frac{1}{3}x^2 = \frac{5}{3}x^2 = 1.66666666666667x^2 \][/tex]

- For [tex]\(x\)[/tex] terms:
[tex]\[ -4x + \frac{5}{3}x = -\frac{12}{3}x + \frac{5}{3}x = \left(-4 + \frac{5}{3}\right)x = -\left(4 - \frac{5}{3}\right)x = -\left(\frac{12}{3} - \frac{5}{3}\right)x = -\frac{7}{3}x = -2.33333333333333x \][/tex]

- For constant terms:
[tex]\[ 5 - \frac{7}{3} = \frac{15}{3} - \frac{7}{3} = \frac{8}{3} = 2.66666666666667 \][/tex]

5. Write down the simplified expression by combining all the simplified terms:
[tex]\[ 1.66666666666667x^2 - 2.33333333333333x + 2.66666666666667 \][/tex]

Thus, the simplified form of the given expression is:
[tex]\[ 1.66666666666667x^2 - 2.33333333333333x + 2.66666666666667 \][/tex]