If you set your equation to equal 7, then you can move 7 to the other side of the equation, and solve for x. This/these values will always result in 7.
e.g.
3x2+11x+6=7
3x2+11x+6-7=7-7
3x2+11x-1=0
Factor using the quadratic formula and solve for x.
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explain formula transformation
All triangles have the same formula A=bh/2. Pick any side you like as a base and multiply by half the height, it will always give the area.
It is often possible to find an explicit formula that gives the same answer as a given recursive formula - and vice versa. I don't think you can always find an explicit formula that gives the same answer.
CTL formula: AG(p -> AFq) CTL* formula: AEAp LTL formula: AGFp
it gives you the midpoint of the line segment you use the formula for