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Maths Puzzle
Numerical Ability
Suppose that an isosceles triangle has sides of length a,a, and b and is such that cos(2A)=sin(B). Show that sin^2(B)= -2sin(A)cos(A)cos(B).
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book Other Question
Find two consecutive positive integers such that the sum of
their squares is 85.
I got 6,7...is that correct/
Given that (3x – a)(x – 2)(x – 7) = 3x3 – 32x2 + 81x – 70, determine
the value of a.