Question

7. (y-7)(y + 3)
11. (xy + 6) (xy-5)
15. (ab-13) (ab - 4)​

Answer 1

Answer:

7. (y-7)(y+3)

= y ( y + 3 ) -7 ( y + 3 )

= y² + 3y - 7y - 21

= y² - 4y - 21

8. (xy+6)(xy-5)

= xy ( xy - 5 ) + 6 ( xy - 5 )

= x²y² - 5xy + 6xy - 30

= x²y² + xy - 30

7. (ab-13)(ab-4)

= ab ( ab - 4 ) -13 ( ab - 4 )

= a²b² - 4ab - 13ab + 52

= a²b² - 17ab + 52

Step-by-step explanation:

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Answer 2

Answer:

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