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Mathematics: Post your doubts here!

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Need help on this question.


At a particular point of a curve y=5x^2 -12x +1 the equation of the normal is x +18y +c=0. Find the value of constant c.
 
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2nd part anyone?
Which year paper is this? :eek: Took hell of a time to think. Well here you go:
Let @ = theta.
sin@ = 1/2
@ = 30 and 150

Now smallest value of @ is 10;
sin(n10) = 1/2
n10 = 30
n = 3.

New range is 0 < @ < 1080
3@ = 30, 150, 390, 510, 750, 870.
@ = 10, 50, 130, 170, 250, 290.

Hence largest possible value of @ = 290.
 
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Which year paper is this? :eek: Took hell of a time to think. Well here you go:
Let @ = theta.
sin@ = 1/2
@ = 30 and 150

Now smallest value of @ is 10;
sin(n10) = 1/2
n10 = 30
n = 3.

New range is 0 < @ < 1080
3@ = 30, 150, 390, 510, 750, 870.
@ = 10, 50, 130, 170, 250, 290.

Hence largest possible value of @ = 290.
Umm I don't remember. Thank you anyway.
 
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Please I need help in a log question. Log(2x+1)=log33. As I cannot write in that font so it should be like 3 is raise to a number to get 3.
2. 3^x . 10^2x=4.20^x-2.
3. Lg(x-1)=ln(e^2-1).
Please I need solutions urgently. Thanks.
 
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