exam Maths Puzzle Numerical Ability

One root of x^2-4x+4a=0 is 2-4i. What is the value of a ?

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exam Other Question

the measure of <1 and the relationship of <1 to <2 is given. Find m<2.

m<1=62 degree, complementary to <2 Simplify :

2

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2 times the square root of 3 + 4