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20 January, 14:33

Expand.

Your answer should be a polynomial in standard form.

(5r+2) (5r-2) =

+5
Answers (1)
  1. 20 January, 17:24
    0
    131.25

    Step-by-step explanation:

    25r²-10r+10r-4=0

    25r²-4=0 (Since - 10 and 10 cancel each other out)

    25r²=4

    Divide both sides by 4 to get r² = 6.25

    Square both sides to get r = 2.5

    Plug 2.5 back into the equation to get the answer of 131.25
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