Simplifying the Expression (10x² - 7x + 7) - (4x² + 5x - 9)
This expression involves subtracting two polynomials. To simplify, we need to distribute the negative sign and then combine like terms. Let's break it down step by step:
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Distribute the negative sign: Remember that subtracting a polynomial is the same as adding its opposite. So, we distribute the negative sign to each term inside the second set of parentheses:
(10x² - 7x + 7) + (-4x² - 5x + 9)
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Combine like terms: Identify terms with the same variable and exponent, then add their coefficients:
(10x² - 4x²) + (-7x - 5x) + (7 + 9)
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Simplify: Finally, perform the arithmetic operations:
6x² - 12x + 16
Therefore, the simplified expression of (10x² - 7x + 7) - (4x² + 5x - 9) is 6x² - 12x + 16.