Year 12s: what will be the first way you research your future options? >>

Don’t understand this question!!

alevels2020

for part c, I thought that you’d sub in x=-5 to dy/dx to get the gradient (which is 20) and then get the negative reciprocal because it’s a tangent. apparently the gradient for that point is just 20 and not -1/20 ? please help.

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Reply 1

username3249896

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but dy/dx gives the gradient of tangent, not the gradient of the normal

the gradient of the normal is -1/m where m is the gradient of the tangent