Huge shortcut here if you just know that for a parabola in standard *ax*^2 + *bx* + *c* form, the *x*-coordinate of the vertex will be at –*b*/(2*a*). In this case, that means it’s at –3/(2(–6)) = 3/12 = ¼.

from Tumblr https://ift.tt/2CRW93a

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Huge shortcut here if you just know that for a parabola in standard *ax*^2 + *bx* + *c* form, the *x*-coordinate of the vertex will be at –*b*/(2*a*). In this case, that means it’s at –3/(2(–6)) = 3/12 = ¼.

from Tumblr https://ift.tt/2CRW93a