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Calculating Values for X and Y by G...
Calculating Values for X and Y by Graphing | TI-83 Plus and TI-84 Plus Graphing Calculators
y=x^2 +5x -7

tu get tangent, dy/dx=2x+5

at x=1, tangent=7

normal is 90 deg tu tangent,

this meen its slope=-1/slope av tangent

normal slope=-1/7=-0.142857142

angel=-8.130 deg

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