exam Maths Puzzle Numerical Ability

(M^2-2M)^2+2(M^2-2M)=15

(M SQUARED MINUS 2M)SQUARED PLUS 2(M SQUARED MINUS 2M) EQUAL 15
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exam Other Question
Given K(x)=-5x-6
Find K(3)-K(x)/5
Can someone help me with this...please! The best base to determine the solution to 2^2x + 1 = 4^x is:
@ Since 4 is a multiple power of 2, 2 is the best base.
a. b = 10
b. b = 2
c. b = e
d. None of the above, there is no solution to the problem