how do you break this down to get the answer 4y^2-8y-20=0

Question

How do you break this problem down step by step to get the answer

Answer 1

You can get answer by factoring it first,

4y²-8y-20 = 4(y²-2y-5) = 0

So, y²-2y-5 = 0

By completing the square,

y²-2y+1 = 6

(y-1)² = 6

Take square root, and isolate y,

y = 1 ± √6 <==Answer