x-intercept is at y=0
y=x^2+6x+8
0=x^2+6x+8
0=(x+4)(x+2)
x=-4,-2
x-intercepts are at (4,0) and (-2,0)
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The quadratic expression x2+6x+8 when factorised equals (x+2)(x+4)
one
(3, -21)
y = x2 - 6x + 2 y = x2 - 6x + 9 - 7 y = (x - 3)2 - 7
2x+6x=-9 => 8x=-9=> x=-8/9