exam Maths Puzzle Numerical Ability

Simplify

c-1 power + d-4 power (Add. Write the answer with all exponents positive).

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exam Other Question

PLEASE HELP ME SIMPLIFY THIS POLYNOMIAL
49-(X+2)^2 I know that this one looks easy but every time I do it I get a different answer! Please help... (radical X-radical 3)(radical 6+ 5)