book Maths Puzzle Numerical Ability

how do I solve 7 to the -4 exponent. what is the answer?

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book Other Question

{{{n^2-3n-18}}}

{{{x^2-16x+64}}}

{{{2x^2+7x+3}}}

{{{2a^2-7a+6}}}

{{{9y^2-16}}}

{{{3a^2+13a+4}}}
3x + 2y = 16
2x + y = 9