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find equation of parabola having focus at (5,0) and directrix x + 5 = 0

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Let the equation of the parabola : y2 = 4ax

Focus : S = (a , 0 ) = (5,0) …. given  a = 5 

Directrix : 

x + a = 0 

x + 5 = 0 ……. Given  a = 5

Hence equation of the parabola : 

y2 = 4ax 

y2 = 4(5)x 

y2 = 20x 

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