Question

The formula P=0.01A^2 + 0.05A + 107 models a woman's normal systolic blood pressure, P, at age A. Use this formula to find the age , to the nearest year, of a woman whose normal systolic blood pressure is 140mm hg.

Answer 1

0.01A²+0.05A+107=140
0.01A²+0.05A-33=0
A²+5A-3300=0
(A+60)(A-55)=0
a=55 or -60 (ignore the negative number because Age cannot be negative)
55 is the answer.