Question

[3-4(3-4)^-1]^-1 = ?

Answer 1

$\mathfrak{SOLUTION:-}$

$[3-4(3-4)^-1]^-1$

$[-1(-1)^-1]^-1$

$[1^-1]^-1$

$1/1^-1$

$1/1$

THEREFORE,
$[3-4(3-4)^-1]^-1=1/1$

$\mathbb{ MUST\:MEMORISE :-}$
While doing this type of problems, you must check the powers i.e. exponents properly and multiply the terms in the brackets with the terms outside the brackets.
when you multiply numbers with opposite signs i.e one number with + and other number with - , your product will be negative. when you multiply the numbers with same signs i.e. the numbers with + or numbers with -, your product will be positive.