Question

$(x {}^{2} + 1)(y {}^{2} + 1) + 9 = 6(x + y) \\ to \: find \: x {}^{2} + y {}^{2}$
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Answer 1

• A real image is the collection of focus points actually made by converging rays, while a virtual image is the collection of focus points made by extensions of diverging rays. ... A real image occurs where rays converge, whereas a virtual image occurs where rays only appear to diverge.

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Answer 2

• A machine is a thing that is created by people to make work easier. It is a tool or invention which multiplies the effect of human effort. The machine produces a mechanical advantage. ... Often a machine will change one form of energy to another form of energy. Simple machines increase or change the direction of a force.

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