4p2+5q2-6r2+7 from 3p2-4q2-5r2-6
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Step-by-step explanation:
+3p^2-4q^2-5r^2-6
+4q^2+5q^2-6r^2+7
- - + -
your answer is -q^2-9q^2+r^2-15.
the meaning of this symbol(^)is someone digit's square or cube.
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