book Maths Puzzle Numerical Ability

In A.D. 1054, Chinese astronomers observed a light from a supernova in the night sky. This supernova was the incredibly powerful origin of what is now the Crab Nebula.

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Need help fast...Please someone show me how to do this.

Solve X in (x-2)(x+5)=0

also

Solve Y in 16(y-3)^2=64

and

Solve Y in y^2+2y-3=0

I am so confused...
Thanks i need help with like-terms. here is one of my problems......

(6v^5-5v)-5(7v^5-2v-7)