Describe three different strategies you could use to verify that these equations are identical:
1) quadratic function: y=0.6(x+4)2+2.4
2) vertex form of the function: y=0.6x2+4.8x+12.
Choose one of the strategies you described and demonstrate whether or not the two functions are equivalent.
You could either a) expand equation 1, b) complete the square on equation 2, c) set up equation 1 equals equation 2 and cancel/simplify
I'll choose completing the square, because expanding is pretty self explanatory.
Completing the square on equation two:
First, factor an 0.6 out of the first two terms, yielding $0.6(x^2+8x)+12$
Second, complete the square on the first two terms by adding a constant, yielding $0.6(x^2+8x+16)-0.6*16+12$.
Simplifying gives $0.6(x+4)^2-0.6*16+12$.
Simplifying further gives $0.6(x+4)^2+2.4$.
Now, setting them equal, we have $0.6(x+4)^2+2.4=0.6(x+4)^2+2.4$, which is true. So, these two functions are equivalent.