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Mathematics 7 Online
OpenStudy (gokuporter):

http://prntscr.com/atwnus

OpenStudy (tommo_lcfc):

Johnny should have distributed the minus sign into all the terms in the second bracket. (6x^2+7x+9)-(2x^2-4x+6) = 6x^2+7x-9-2x^2+4x-6 = 4x^2 +11x - 15

Directrix (directrix):

Visual of above description. ^^^^

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