exam Maths Puzzle Numerical Ability

Please help, I am stuck again.....

Use a coefficient of friction of 0.4 in the formula from example 6 and find the speeds of cars that left skid marks oflenghts 150 feet, 200 fe

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I did the problem but it seems to be missing the -3 what did I do wrong?

x=-3
x=-2
-x^2-5x-6

2(2)^2-5(-2)+1
2(6)-5(-2)+1
=12-5-(-2)+1
=12-5--1
=8 Would someone check this for me and see if it is correct? I do apreciate it and thank you so much.

Add -3/5 + (8/35)

My answer is -13/35