4. 6x³ - 4x² +7 or 7x³ - 6x² + 4 for x = 3
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We will write it as a fraction in ordet to solve, that is:
We then operate as follows:
We have this, since 1 integer will be equal as a numerator divided by a denominator with equal values. Examples 1 = 2/2, 1 = 45/45, ...