Answer
a. $x=-1$, $x=2$
b. $x=\frac{1}{3}$
Work Step by Step
a.
$x^2-x=\log_{5}25$
$5^{x^2-x}=25$
$5^{x^2-x}=5^2$
$x^2-x=2$
$x^2-x-2=0$
$(x+1)(x-2)=0$
x=-1, x=2
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b.
$3x+5=\log_{2}64$
$2^{3x+5}=64$
$2^{3x+5}=2^6$
$3x+5=6$
$3x=1$
$x=\frac{1}{3}$