4. Subtract: p2 - q? + 5r2 from q? - p2r2
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Sorry by mistake !! Please delete it
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Step-by-step explanation:
(q² - p²r²) - (p² - q² + 5r²)
= q² - p²r² - p² + q² - 5r²
= 2q² - p²r² - p² - 5r²
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