exam Maths Puzzle Numerical Ability

can you please check this for me? I have to solve by using the quadratic formula.

5x^2+x+10=0
a=5
b=1
c=10
b^2-4ac=1^2-4*5*10=-199
-199 is less than 0 so no solution is defined

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how do you do operations and unit analysis problems? Simplify

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