Answer:
=15s²t³+9s³t+3t²x²
Step-by-step explanation:
9s3t+15s2t3−(−3x2)(t2)
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Answer:
=15s²t³+9s³t+3t²x²
Step-by-step explanation:
9s3t+15s2t3−(−3x2)(t2)