I know this should be done on excel, but can anyone walk me through it?

Problem 5 To analyze the vibrations of cantilevered Euler-Bernoulli beam, one has to solve the characteristic equation cos(BL)cosh(BL)+1=0 where L is the length of the beam and is a function of the beam density, modulus of elasticity, cross-sectional area, and area moment of inertia. Note that this equation is transcendental and has an infinite number of solutions. To make this look like our root-finding problems from class, we'll define x = BL so that our equation to be solved is cos(x)cosh(x)+1=0 (a) Verify that a root exists in the interval 0