Question

Solve the following quadratic equation by factorisation y2-8y-9=0

Answer 1

Answer:

9

Step-by-step explanation:

y²-8y-9=0

=>y²-(9-1)y-9=0

=>y²-9y+y-9=0

=>y(y-9)+1(y-9)=0

=>(y+1)(y-9)=0

As it is multiplication then on of the number will be 0

Let (y-9) be 0

Then,

y-9=0

=>y=9

Hope it is clear...

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Answer 2

Answer:

y²-(9-1)y-9

y²-9y+y-9

y(y-9)+1(y-9)

(y+1)(y-9)