Question

multiply $4x(x - 5)$
a. $4x^2 - 20x$
b. $4x^2 + 20x$
c. $4x^2 - 5x$
d. $4x^2 + 5x$
\\(\bigcirc\\) a
\\(\bigcirc\\) b
\\(\bigcirc\\) c
\\(\bigcirc\\) d

Explanation:

Step1: Apply distributive property

Use the distributive property \(a(b + c)=ab+ac\) (here \(c\) is \(- 5\)), so \(4x(x - 5)=4x\times x-4x\times5\)

Step2: Simplify each term

Simplify \(4x\times x = 4x^{2}\) and \(4x\times5 = 20x\), so we get \(4x^{2}-20x\)

Answer:

A. \(4x^{2}-20x\)