Euler's Method for slope fields

I tried to do euler’s method with this problem:
$$\frac{dw}{dt} = (3-w)(w+1),\quad w(0) = 0,\quad \text{and }t\in [0,5].\quad \Delta t = 0.5.$$

But am getting weird results like for $y_2 = 5.25$, $y_3= -15.84375$;
but checked against the book but this is not correct. Can you please work out some iterations?

$y_2 = 1.5 + (3-1.5)(1.5+1)(1) = 5.25$, for example

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