can someone explain me this question... the person who answers step by step and in detail will be marked as brainlist...
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Refer the attachment friend...
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Answer:
p+q-pq+r^2
Here, taking p as -1, q as -3 and r as 7
The equation becomes
(-1)+(-3)-((-1)×(-3))+(7)^2
= -1-3-3(multiplying -1 and -3 becomes 3)+49
= -7+49
= 42.
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