Question

y(y-5)-3(y+5) factories the following
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Answer 1

Answer:

Given : x(a−5)+y(5−a)

We can write the given question as x(a−5)+y(−1)(a−5)

x(a−5)+y(5−a)=x(a−5)−y(a−5)

so we get,

x(a−5)+y(5−a)=(x−y)(a−5)

Step-by-step explanation:

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Answer 2

Answer:

y=5 or y=3

Step-by-step explanation:

y(y-5)-3(y+5)

= y(y-5)-3(y+5)

= y²-5y-3y+15

= y²-8y+15

y²-8y+15

= y²-8y+15=0

= y²-3y-5y+15=0

= y(y-3)-5(y-3)=0

= (y-5)(y-3)=0

= y-5=0 or y-3=0

= y=5 or y=3