Jawaban:
(-3r²-9r)-(-5r² - 12r) = -3r²-(-5r²)-9r-(-12r) = -3ŕ²+5ŕ²-9r+12 = 2r² + 3r
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Jawaban:
(-3r²-9r)-(-5r² - 12r) = -3r²-(-5r²)-9r-(-12r) = -3ŕ²+5ŕ²-9r+12 = 2r² + 3r