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Y= mX + c, 'X' is the horizontal value on the axis, the input value. The 'm' represents the gradient of the line, figured out by the change in y divided by the change in x. The 'c' value is the y intercep...
If you were to factorise this quadratic to find out its roots, you would get:
(x+1)(x+2)
which gives us roots of -1 and -2.
Remember that roots are where the graph crosses the x-axis,...
x2 + 8x = (x + 4)2 - 16, so x2 + 8x - 5 = (x + 4)2 - 16 - 5 = (x + 4)2 - 21, so then (x + 4)2 - 21 = 0 (x + 4)2 = 21 -----> ...
y = 3x - 3
x^2= 4(x^2 - 6x + 9)
x^2= 4x^2- 24x + 36
3x^2 - 24x + 36= 0
(x-2)(x-6)=0
x= 2 or x=6
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