Question

PLS ANSWER

An equation is shown below.

X²=64
Which is a possible value of the expression 2x–20?

a -2
b 2
c -4
d 4

Answer 1

The answer would be C. -4.

Explanation:

x^2=64

x=8

2(8)-20=-4

Answer 2

Explanation:

• Here, We are given the value of x and we need to solve for x first of all and then put that value of x in the second equation...

X²=64 ----- 1️⃣

2x-20 ----- 2️⃣

By equation 1️⃣ we have:

`\sf {x}^(2) = 64 \\ \sf \: x = √(64) \\ \sf \: x = 8`

Substitute this value into equation 2️⃣:

`\sf \: 2x - 20 \\ \sf \: 2 * 8 - 20 \\ \sf \: 16 - 20 \\ \boxed{ \tt \: - 4}`