Chu Thị Linh Trâm
Giới thiệu về bản thân
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2025-04-08 21:01:55
20x^3 - 10x^2 + 5x - 20x^3 + 10x^2 - 4x = -36
20x^3 - 20x^3 - 10x^2 + 10x^2 + 5x - 4x = -36
x = -36
2025-04-08 20:59:02
P(x) + Q(x) = (x^4 - 5x^3 + 4x - 5) + (-x^4 + 3x^2 + 2x + 1)
P(x) + Q(x) = x^4 - x^4 - 5x^3 + 3x^2 + 4x + 2x - 5 + 1
P(x) + Q(x) = -5x^3 + 3x^2 + 6x - 4
R(x) = P(x) - Q(x) = (x^4 - 5x^3 + 4x - 5) - (-x^4 + 3x^2 + 2x + 1)
R(x) = x^4 + x^4 - 5x^3 - 3x^2 + 4x - 2x - 5 - 1
R(x) = 2x^4 - 5x^3 - 3x^2 + 2x - 6
P(x) + Q(x) = -5x^3 + 3x^2 + 6x - 4
R(x) = 2x^4 - 5x^3 - 3x^2 + 2x - 6