General vertex form:

Given :

Extract "spread factor" m

Complete the square


Write as a squared binomial and simplify the constant

Re-write to match signs of standard general form:

Jerry had a 3 in 10 chance or a 30 percent chance to hit area A randomly
Answer:
use PEDMAS
P: PARENTHESIS
E: EXPONENTS
D: DIVISON
M: MULTIPLICATION
A: ADDITION
S: SUBTRACTION
Step-by-step explanation:
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