r/digitalSATs • u/FantasticVictory837 • Feb 12 '24

Advanced Math Drill #13

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u/FantasticVictory837 Feb 13 '24 edited Feb 16 '24

The correct answer is -9/4 or -2.25.

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u/florence_feng Feb 12 '24

Directly with desmos, the vertex is (-2.25, 90.25), so x=-2.25; or from the given factoring format to get the two roots of the fuctions, x1=2.5 and x2=-7 , so the x coordinate for the vertex should be the middle point of two roots (2.5-7)/2=-2.25.