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If p(x) = x3 + 2x2 – 3x + 1 and q(x) = x3 – 2x2 + 3x + 5(a) Find p(x) + q(x). What is its degree?(b) Find p(x) – q(x). What is its degree? |
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Answer» (a) p(x) = x3 + 2x2 – 3x + 1, q(x) = x3 – 2x2 + 3x + 5 p(x) + q(x) = x3 + 2x2 – 3x + 1 + x3 – 2x2 + 3x + 5 = 2x3 + 6 Degree = 3 (b) p(x) – q(x) = x3 + 2x2 – 3x + 1 – (x3 – 2x2 + 3x + 5) = x3 + 2x2 – 3x + 1 -x3 + 2x2 – 3x – 5 = 4x2 – 6x – 4 Degree = 2 |
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