book Maths Puzzle Numerical Ability

The directions ask to use the distribustive Property to write each expression as an equivalent expression. Then evaluate each expression. Please help The first one is 6(80+1) I think it would be 6(80)+6(1)=486 is this how i do this?

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book Other Question

Q. How would you solve both of these equations. y^2 = 5x + 2x - 2. the next equation i don't understand is y= 3x^4 + 4x + 1. For both of these i need to know the y-intercept, the x-in x^2+x+1=0
Can u please solve it and show me how to check it? thank you very much.