CPM Homework Help : CCA2 Problem 8-78

Solve each equation.

$5.2(3.75)^x = 100$
Hint (a):
Divide by $5.2$ and then use logarithms.
Answer (a):
$x ≈ 2.24$

$4 + 3x^4 = 81$
Hint (b):
Isolate $x^4$ then use roots or fractional exponents.
Answer (b):
$x = \pm \sqrt [ 4 ] { \frac { 77 } { 3 } } \approx \pm 2.25$