Solve
-The Force in Newtons Needed to Stretch a Certain $x$

Multiple Choice

Solve.
-The force in newtons needed to stretch a certain spring $x$ centimeters from its resting position is given by the polynomial function $f ( x ) = 6 x ^ { 2 }$ , where 6 is the spring constant. If a force of 150 newtons is applied, how far will the spring be stretched?

A) $5 \mathrm {~cm}$
B) $25 \mathrm {~cm}$
C) $30 \mathrm {~cm}$
D) $6 \mathrm {~cm}$