Test # 2: Multiplying Polynomials

Which of the following is NOT true about multiplying monomials?

• Multiply the numerical coefficients.

• Multiply the exponents of the variables, if the variables are the same.

• Add the exponents of the variables, if the variables are the same.

• Multiplying two negative monomials obtains a positive result.

Which of the following is the correct equivalent expression of 3x+7x?

• 21x

• 21x²

• 10x

• 10x²

Which of the following is the correct equivalent expression of (-4a)(9a)?

• 5a

• 5a²

• -36a

• -36a²

Multiply: (-2a³)(5a⁴)(7a)

• 10a⁸

• 70a⁸

• -70a⁷

• -70a⁸

Multiply: (5x³y)(9x⁵y⁸)

• 14x⁸y⁹

• 45xy¹⁷

• 45x⁸y⁸

• 45x⁸y⁹

Multiply: 8m²(3m³+6m-5)

• 18m⁴+33m³-40m²

• 24m⁵+40m³-40m

• 24m⁶+48m²-40m²

• 24m⁵+48m³-40m²

Multiply: 7ab(5a²-3ab+4a)

• 35a³b-21a²b²+28a²b

• 35a³b-21ab+28a²b

• 30a³b-21a²b²+28a²b

• 35a³b-21a²b²+24a²b

Multiply: (8g+5h)(10g+3h)

• 169g²h²

• 80g²+24gh+15h²

• 80g²+50gh+15h²

• 80g²+74gh+15h²

Multiply: (9a+5b)(7a-3b)

• 63a²+8ab-15b²

• 63a²+8ab+15b²

• 63a²+62ab-15b²

• 63a²-62ab-15b²

Multiply: (5x-2y)(3y-8)

• 6y²+15xy-40x+16y

• -6y²+15x-40x+16y

• -6y²+15xy-40x+16y

• -6y²+15xy-40x-16y