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21-09-2022
Mathematics

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if m ∟n, solve for x. (x + 21) (3x + 9) giving brainliest

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21-09-2022

Answer:

[tex](x + 21)(3x + 9) \\ x(3x + 9) + 21(3x + 9) \\ 3 {x}^{2} + 9x + 63x + 189 \\ 3 {x}^{2} + 72x + 189[/tex]

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