Question 412494

symbolically (by factoring):


{{{x^2 - 225 = 0}}}


{{{x^2 - 15^2=0 }}}


{{{(x -15)(x+15)=0 }}}


{{{x}}} = +-{{{15 }}}


numerically (using table):

x   |  y            |{{{x^2 - 15^2=0 }}}
0   |  -225         |{{{0^2 - 15^2=-225 }}} 

15  |   0           |{{{15^2 - 15^2=225-225=0 }}} 

10  |  -125         |{{{10^2 - 15^2=100-225=-125 }}} 

20  |   175         |{{{20^2 - 15^2=400-225=175 }}} 


graphically

{{{ graph( 500, 500, -250, 255, -250, 250, x^2 - 225) }}}