exam Maths Puzzle Numerical Ability

p squared+5p-5=0

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Can someone please explain this and dumbify it down - thank you so much in advance:

Multiply:
(5√[2] + 3)(√[2] - 2√[3])
This is a problem from our homework. I can get all of the answers except for part d.

20. A car that weighs 3000 lbs is at rest on a hill. Three forces are acting on the car: th