Question 927691
7^-x+8 = 15^-2x
there are two formulas here
1) y = (7^-x)+8
2) y = 15^-2x
graph the two equations and we find that they intersect at x approx -0.43
red is 1 and green is 2
{{{ graph( 300, 200, -1.5, 1.5, 0, 50, (1/7^x)+8, 1/15^(2x)) }}}