Question

Which of these is a correct expansion of (3x-1)(4x^2+5)

Answer 1

The correct expansion of $(3x-1)(4x^2+5)$ is $12x^3-4x^2+15x-5$

Step-by-step explanation:

We need to expand the expression:

$(3x-1)(4x^2+5)$

Solving the expression:

$(3x-1)(4x^2+5)$

$=3x(4x^2+5)-1(4x^2+5)\\=12x^3+15x-4x^2-5\\Rearranging:\\=12x^3-4x^2+15x-5$

So, the correct expansion of $(3x-1)(4x^2+5)$ is $12x^3-4x^2+15x-5$

Keywords: Expansion of terms

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Answer 2

Answer:

3x • 4x2 + 3x • 5 + (–1) • 4x2 + (–1) • 5

Step-by-step explanation:

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