Solve
3x^2= 147
x=
X=

x = 7 or x = -7

Step-by-step explanation:

First, divide both sides by 3 so we leave with x^2.

Now we have x^2 = 49, remember that we are solving a quadratic equation which means x-values and their counterpart aka negative forms give same output value.

Ex.

2^2 is 4 and (-2)^2 is 4 as well.

3^2 is 9 and (-3)^2 is 9 as well.

Since both positive and negative or counterpart form give same output, when we square both sides, write plus or minus (apply plus or minus when the degree of term is even such as x^2, x^4, x^6, etc.)

Hence,

Therefore, x = 7 or x = -7 (you can write x = ± 7 instead)

answer: 800

step-by-step explanation:

all three statements are true

step-by-step explanation:

a shipping fee of 5% is charged online with every item purchased online

first let's just take each option and calculate them based on this, to see if the answers matched

keith buys a 40 dollar book

40 x 0.05 = 2

therefore there will be a two dollar fee on keith's book

40 + 2 =42

the first statement is true

a chair costs $80

80 x 0.05 = 4

80 + 4 = 84

the second statement is true

george buys a 20 dollar calculator

20 x 0.05 = 1

20 + 1 = 21

the third statements are true

all three statements are true