Book Maths Puzzle Co-ordinate geometry

Is (y+4)(y-5)= 0 is the answer y squared - 1y - 20 if not please explain.

Read Solution (Total 1)

y^2-y-20=0
=> (y-5)(y+4)=0
=> y=5,-4 are roots
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Book Other Question

(Determine the price for renting apartments)
The proprietor of an apartment building can rent all 50 apartments if the rent is $150 per month for each apartment. For each $5 incr how would u solve a the quadratic equation 3m(m+5)=0 by factoring?