4 + 4 = 8.Get it?You multiple the number 2 times and then you add 2.It's very confusing.
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2x2 + 4 + 1 = 2x2 + 5 So, the vertex is (0, 5)
2x2+13x+15 = (2x+3)(x+5)
d/dx 2x2+3x+7=4x+3
2x2 + 15x + 25 = (2x + 5)(x + 5)
2x2 + 11x + 15 = (x + 3)(2x + 5).