sairaanwar67
27.10.2020 •
Mathematics
Why are my points going up? I'm not even answering anything.
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Ответ:
idk Imao
Step-by-step explanation:
Ответ:
C'um ;
Ответ:
a + b = 7
Step-by-step explanation:
a^2 - b^2 = 21
Factor the left side. It is the difference of two squares which factors into the product of a sum and a difference.
(a + b)(a - b) = 21
We are told a - b = 3, so substitute 3 for the factor a - b.
(a + b)(3) = 21
Divide both sides by 3.
a + b = 7