What is the common ratio of the sequence? -2, 6, -18, 54.... -3 -2 3 8
2 answers:
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- Vertex form:
So firstly, put x^2 - 4x into parentheses:
Next, we need a perfect square inside the parentheses. Divide the x coefficent by 2 then square that result. In this case, -4 ÷ 2 = -2, (-2)²= 4. Add 4 inside the parentheses and then subtract 4 outside the parentheses:
Lastly, factor what's inside the parentheses and <u>your vertex form is </u>