Haha, you first start off with adding 3 to both sides, cancelling the -3, and adding it to 9. you end up with 5x=12, in which you divide both sides by 5. you get 2 and 2/5 or 12/5! hope that helps :)
300.
You can multiply by .75 to get the 25% off.
(x^2 +5x+2.5^2) +4+5
(x+2.5)^2+9
vertex -2.5,9
Step-by-step explanation:
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