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5x2 – 2x – 3x2 + 6x – 21= 2x2 + 4x − 21

12² = 4² + x² [This is pythagoras' theorem (a² = b² + c²) ]
144 =16 + x ^2
128 = x²
11...

d (3 + xy) = 4
d = 4/(3 + xy)

Firstly, we will find the volume of the cylinder using the formula V_cylinder =π r²h . Inputting the numbers given in the question gives V_cylinder = 36π.Given that V_cylinder = V_cone, and usi...

When asked to solve we have to find the value of x and the value of y, as they are simultaneous equations we know the value of y in equa...