Question

pls answer 85. with full steps pls pls

Answer 1

Hey !

Check the attachment !!

Answer 2

$Given : 3^{2x^2 - 9x} = (81)^{-1}$

$3^{2x^2 - 9x} = (3^4)^{-1}$

2x^2 - 9x = -4

2x^2 - 9x + 4 = 0

2x^2 - 8x - 1x + 4 = 0

2x(x - 4) - 1(x - 4) = 0

(2x - 1)(x - 4) = 0

x = 1/2,4  (or) 4, 1/2.


Hope this helps!