exam Maths Puzzle Numerical Ability

Find the GCF after simplifying: 4i+8i^2(-23-8i)^2

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exam Other Question

In 1985, the Lincoln Memorial was 1 1/2 times as old as the Jefferson Memorial. If the Lincoln Memorial was built 21 years before the Jefferson Memorial, give the year each memorial was built. How do I factor this trinomoial:

5x^2+16x+3