Express x^2 + 10 x+15 in the form (x+ p)^2 +q

4. a spring scale is constructed so that each 0.10-n increment is separated by 0.50 cm. what spring constant is necessary for the scale to be accurate? -1.0n/cm -0.10n/cm -9.8 n/cm -0.20n/cm

Ineed to know the answer to this algebra question.

How can writing phrases as algebraic expressions you solve problems?