[tex]b^2-5c[/tex]
The value of b is 15 and the value of c is 9, then
We will substitute b in the expression by 15 and c by 9
[tex]b^2-5c=(15)^2-5(9)[/tex]
Since (15)^2 = 15 x 15 = 225
Since 5 x 9 = 45, then
[tex]b^2-5c=225-45[/tex]
Subtract 45 from 225
[tex]b^2-5c=180[/tex]
The value of it is 180
