exam Maths Puzzle Numerical Ability

HELP:

BRIAN COSTA DEPOSITED $20,000 IN A NEW SAVINGS ACCOUNT AT 12 % INTEREST COMPOUNDED SEMIANNUALLY. AT THE BEGINNING OF YEAR 4, BRIAN DEPOSITS AN ADDITIONAL $30,000 AT 12 %

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exam Other Question
x^2+6x=7

Solve by completing the square to obtain exact solutions. How would you factor out the greatest common factor of this binomial?

x^5-6x^2