Question 1118936
If x^y = a and x^4y-4 = 77, find the value of a
<pre>{{{matrix(1,3, x^(4y) - 4, "=", 77)}}}
{{{matrix(1,3, x^(4y), "=", 81)}}}
{{{matrix(1,3, x^(4y), "=", 3^4)}}}
{{{matrix(1,3, (x^y)^4, "=", 3^4)}}}
{{{matrix(1,3, highlight((x^y))^4, "=", highlight(3)^4)}}}
{{{matrix(1,3, highlight((a))^4, "=", highlight(3)^4)}}} ------ Substituting {{{matrix(1,3, a, for, x^y)}}}
{{{matrix(1,7, x^y, "=", a, and, x^y, "=", 3)}}}, and so, {{{highlight_green(matrix(1,3, a, "=", 3))}}}