The Student Room Group

Logarithms

The two curves y=5 x 4^x and y=4^-x intersect at the post P. Show that the coordinate of the point P is a root of the equation 4^2x=0.2
Reply 1
y=5×4x and y=4x y=5\times4^x \text{ and } y=4^{-x} .
So if you subtract one from the other can you get it into a similar form?

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