# Common Core: Seeing Structure in Expressions

##### HSA.SSE.A1

Interpret expressions that represent a quantity in terms of its context.*

October 1, 2018##### HSA.SSE.A1a

Interpret parts of an expression, such as terms, factors, and coefficients.

October 1, 2018##### HSA.SSE.A1b

Interpret complicated expressions by viewing one or more of their parts as a single entity. For example, interpret P(1+r)n as the product of P and a factor not depending on P.

October 1, 2018##### HSA.SSE.A2

Use the structure of an expression to identify ways to rewrite it. For example, see x⁴ – y⁴ as (x²)² – (y²)², thus recognizing it as a difference of squares that can be factored as (x2 – y2)(x2 + y2).

October 1, 2018##### HSA.SSE.B3

Choose and produce an equivalent form of an expression to reveal and explain properties of the quantity represented by the expression.*

October 1, 2018##### HSA.SSE.B3a

Factor a quadratic expression to reveal the zeros of the function it defines.

October 1, 2018##### HSA.SSE.B3b

Complete the square in a quadratic expression to reveal the maximum or minimum value of the function it defines.

October 1, 2018##### HSA.SSE.B3c

Use the properties of exponents to transform expressions for exponential functions. For example the expression 1.15t can be rewritten as (1.151/12)12t ≈ 1.01212t to reveal the approximate equivalent monthly interest rate if the annual rate is 15%.

October 1, 2018##### HSA.SSE.B4

Derive the formula for the sum of a finite geometric series (when the common ratio is not 1), and use the formula to solve problems. For example, calculate mortgage payments.*

October 1, 2018