Question

Which equations are correct? Select each correct answer. −5x3(3x3+2)=−15x9−10x3
−3y5(2y3+3)=−6y8−9y5
−2c6(5c3+6)=−10c9−12c6
−4b4(5b2+6)=−20b8−24b3

Answer 1

The answer to the question is the second and third equations

Answer 2

Step-by-step explanation:

$x^m\time x^n=x^{m+n}$ Formula used

1) $-5x^3(3x^3+2)\neq -15x^9-10x^3$

$-15x^6-10x^3=-15x^9-10x^3$   (Incorrect)

2)$-3y^5(2y^3+3)=-6y^8-9y^5$

$-6y^8-9y^5=-6y^8-9y^5$   (Correct)

3)$-2c^6(5c^3+6)=-10c^9-12c^6$

$-10c^9-12c^6=-10c^9-12c^6$    (Correct)

4)$-4b^4(5b^2+6)=-20b^8-24b^3$

$-20b^6-24b^4\neq -20b^8-24b^3$   (Incorrect)