please answer the b,d,f
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Answer:
(b) -5x^2-(3x^2)
-5x^2-3x^2=-8x^2
(d) -8mn-(-11mn)
-8mn+11mn=3mn
(f) 21a^2 b-(-15a^2b)
21a^2 b+15a^2 b=36a^2 b
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b)(-5x²)+3x²
=-2x²
d)(-8mn)(-11mn)
=18mn
f)21ab-15a²b
=6a³b²
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