if x = \frac{ \sqrt{5} - 2}{ { \sqrt{5} } \ - 2 }x= 5 −2 5 −2 y = \frac{ \sqrt{5} + 2 }{ \sqrt{5} -2 }y= 5 −2 5 +2 then show that {x}^{2} - {y}^{2} = - 144 \sqrt{5}x 2 −y 2 =−144 5
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There are many examples of forces in our everyday lives: weight force (i.e. the weight of something) the force of a bat on the ball. the force of the hair brush on hair when it is being brushed. the force of your foot pushing on the pedal when you ride your bike
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