Tuesday, November 22, 2011

Evaluate the solutions of the equation 4^(x^2-4x)=1/64

This is an exponential
equation.


For the beginning, we'll write 1/64 =
1/4^3


We'll apply the property of negative
power:


1/4^3 = 4^(-3)


Now,
we'll re-write the equation:


4^(x^2-4x) =
1/64


4^(x^2-4x) = 4^(-3)


Since
the bases are matching, we'll apply one to one
property:


x^2-4x = -3


We'll
add 3 both sides:


x^2-4x+3 =
0


According to the rule, the quadratic equation could be
written as:


x^2 - Sx + P =
0


From Viete's relations, we'll
get:


S = x1 + x2


x1 + x2 =
4


x1*x2 = 3


x1 =
1


x2 =
3


The solutions of the
equation are :{1 ; 3}.

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