x+(-2.5)+6.8=0
x+(-2.5+6.8)=0
x+(4.3)=0
x+4.3=0
Subtract 4.3 from both sides and you get:
x= -4.3
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It is, as stated, x2 - 5x + 25/4 = 0
Factorising, we have, 9x2+ 30x + 25 = (3x + 5)2;thus, when y = 0, x = -1⅔. This tells us that the sole x-intercept of this function is at the vertex, (0, 1⅔).
x = 0
x = -½
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