annagwhiteou0hrh
04.07.2019 •
Mathematics
Find the product of (3x+7y)^2 a) 9x^2 - 42xy + 49y^2 b) 9x^2 - 49y^2 c) 9x^2 + 49y^2 d) 9x^2+42xy+49y^2
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Ответ:
(3x+7y)² the form is ax² + 2ab + b² where a is 3x and B is 7y
so its
(3x)² + 1(3x)(7y) + (7y)²
9x² + 21xy + 49y²
Ответ:
9x^2 − 42xy + 49y^2
Step-by-step explanation:
Ответ: