1.
1)
y = x - 8;
y' = 1;
2)
y= x^2 - x;
y' = 2x - 1.
2.
y = x^2 * (x + 3);
y' = 2x * (x + 3) + x^2 * 1 = 2x^2 + 6x + x^2 = 3x^2 + 6x;
y'(x1) = 3 * 0 ^ 2 + 6 * 0 = 0;
y'(x2) = 3 * 2 ^ 2 + 6 * 2 = 12 + 12 = 24;
y = (3 - x)*(x + 8);
y' = -1 * (x + 8) + 1 * (3 - x) = -x - 8 + 3 - x = -2x - 5;
y'(x1) = -2 * 0 - 5 = -5;
y'(x2) = -2 * 2 - 5 = - 9.
3.
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Answers & Comments
1.
1)
y = x - 8;
y' = 1;
2)
y= x^2 - x;
y' = 2x - 1.
2.
1)
y = x^2 * (x + 3);
y' = 2x * (x + 3) + x^2 * 1 = 2x^2 + 6x + x^2 = 3x^2 + 6x;
y'(x1) = 3 * 0 ^ 2 + 6 * 0 = 0;
y'(x2) = 3 * 2 ^ 2 + 6 * 2 = 12 + 12 = 24;
2)
y = (3 - x)*(x + 8);
y' = -1 * (x + 8) + 1 * (3 - x) = -x - 8 + 3 - x = -2x - 5;
y'(x1) = -2 * 0 - 5 = -5;
y'(x2) = -2 * 2 - 5 = - 9.
3.