Given the following function in two variables x and y
f(x, y) = x3y + 2x4 + y5
a. Find the Jacobean determinant at points P (3,2)
b. Find the Hessian determinant at points P (1,3)
"f'_x=3x^2y+8x^3,"
"f'_y=x^3+5y^4,"
"f''_x=6xy+24x^2,"
"f''_y=20y^3,"
"f''_{xy}=3x^2."
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