1.) Multiply the parentheses by -5x 2.) Move the constant to the left 3.) Change the signs 4.) Solve the quadratic equation 5.) Evaluate the powers and multiply 6.) Calculate
Step 1: get the difference between the two cecreals: 1.81 - 1.21 = 0.6 mg
Step 2: divide the difference by the original number and then multiply the quotient by 100 to get the percentage % of increase = (0.6/1.21) * 100 = 49.58%