Now we will multiply the two first matrices on LHS using the formula c_ij = a_i1b_1j + a_i2b_2j + … + a_inb_nj, we get

Again multiply these two LHS matrices, we get

⇒ x² – 9x + 32x = 0

⇒ x² – 23x. This is form of quadratic equation, we will solve this, we get

⇒ x(x – 23) = 0

⇒ x = 0 or x – 23 = 0

This gives, x = 0 or x = 23 is the required solution of the matrices.