∫ (3x^2 + 4x^3) dx = 3 ∫ x^2 dx + 4 ∫x^3 dx = 3* x^3/3 + 4 *x^4/4 + C =
= x^3 + x^4 + C
y = x^3 + x^4 + C
15 = 2^3 + 2^4 + C
15 = 24 + C
C = - 9
y = x^3 + x^4 - 9
(а³-3)²(а³+3)-а^9=(а³-3)(а^6-9)-а^9=а^9-3а^6-9а³+27-а^9=-3а^6-9а³+27=-3(а^6+3а³+9)
<span>2 целых 5/16=37/16=2,3125</span>