Answer:
The correct answer are the second and the fourth.
Step-by-step explanation:
The correct equations could be founded by using the distributive property. When we have multiplying exponents this are added.
[tex]-3y^{4} (5y^{2} +2)=-15y^{6} -6y^{4}[/tex] Incorrect
[tex]-5d^{3} (3d^{2} +4)=-15d^{5} -20d^{3}[/tex] Correct
[tex]-7x^{2} (4x^{3} +2)=-28x^{5} -14x^{2}[/tex] Incorrect
[tex]-2b^{3} (6b^{2} +5)=-12b^{5} -10b^{3}[/tex] Correct
The correct answer are the second and the fourth.
