exam Maths Puzzle Numerical Ability

Given K(x)=-5x-6
Find K(3)-K(x)/5
Can someone help me with this...please!

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exam Other Question

many years from now two old best friends, carrie and valerie, run into eachother at a resteraunt. they have not seen each other in years.

carrie:how are you? what are you doing (M^2-2M)^2+2(M^2-2M)=15

(M SQUARED MINUS 2M)SQUARED PLUS 2(M SQUARED MINUS 2M) EQUAL 15
solve

thanks