Question

Which of these expressions CANNOT be simplified by combining like terms?

5ab3+7−3a2b2+a3b−10
5ab3+3a2b2+a3b−10
5ab3+2b(3ab2)+a3b−10
5a3b3+3a2b2+a3b3−10ab

Answer 1

$<marquee behavior = left>Answer$

5ab3 + 3a2b2 + a3b -10