Answer:
15a2b2 – 20a2b + 6ab2 – 4ab + 7
Explanation:
25a2b2+4a2b+6ab2-4ab+7
=sum of two polynomials -one addend
=20a2b2-8a2b+6ab2-4ab+2-(-5a2b2+12a2b-5)
=20a2b2-8a2b+6ab2-4ab+2+5a2b2-12a2b+5
=25a2b2+4a2b+6ab2-4ab+7
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