Calculus
posted by Graham .
Find the number b such that the line y = b divides the region bounded by the curves y = 4x2 and y = 1 into two regions with equal area. (Round your answer to two decimal places.)

We need the whole area to be twice the
area under the line y=b.
y(1/2) = 1
y(√b/2) = b
So, integrating along x, we need
∫[0,1/2] 14x^2 dx = 2∫[0,√b/2] b4x^2 dx
Now just evaluate the integrals and solve the polynomial for b.