(a2+2b2) and (5a - 3b)
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When the object is placed between principal focus and pole of a concave mirror, an enlarged, virtual and erect image is formed behind the mirror.
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(a²+2b²)(5a-3b)
=a²(5a-3b)+2b²(5a-3b)
=5a³-6b³-3a²b+10ab²
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