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Answer:
1.) -x - 4
2.) 13x² - 12x + 6
Step-by-step explanation:
1. x - 2x -4
re-order and gather like terms.
(x - 2x) - 4
collect coefficients of like terms.
(1 - 2) × x - 4
calcuate the sum or difference.
2. x² - 7x + 12x² - 5x + 6
re-order and gather like terms.
(x² + 12x²) + ( –7x – 5x) + 6
collect coefficients of like terms.
(1 + 12)x² + (-7 - 5) × x + 6
calcuate the sum or difference.