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Add the given polynomials. i. x3 – 2x2 – 9; 5x3 + 2x + 9 ii. -7m4 + 5m3 + √2; 5m4 – 3m3 + 2m2 + 3m – 6 iii. 2y2 + 7y + 5; 3y + 9; 3y2 – 4y – 3 |
Answer» i. (x3 – 2x2 – 9) + (5x3 + 2x + 9) = x3 – 2x2 – 9 + 5x3 + 2x + 9 = x3 + 5x3 – 2x2 + 2x – 9 + 9 = 6x3 – 2x2 + 2x ii. (-7m4 + 5m3 + √2 ) + (5m4 – 3m3 + 2m2 + 3m – 6) = -7m4 + 5m3 + √2 + 5m4 – 3m3 + 2m2 + 3m – 6 = -7m4 + 5m4 + 5m3 – 3m3 + 2m2 + 3m +√2 – 6 = -2m4 + 2m3 + 2m2 + 3m + √2 – 6 iii. (2y2 + 7y + 5) + (3y + 9) + (3y2 – 4y – 3) = 2y2 + 7y + 5 + 3y + 9 + 3y2 – 4y – 3 = 2y2 + 3y2 + 7y + 3y – 4y + 5 + 9 – 3 = 5y2 + 6y + 11 |
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