Question

Justify each step of the proof.

Conjecture: If 2(x2 + 5) = 60, then x is 5 or –5.

1. 2(x2 + 5) = 60 1.

2. 2x2 + 10 = 60 2.

3. 2x2 = 50 3.

4. x2 = 25 4.

5. x = ±5 5.

need help solving step by step

Answer 1

the first is "given" (because it's the given equation/information)

Answer 2

ok

Answer 3

how do i solve the rest

Answer 4

For the others, you will need http://www.mathwords.com/e/equation_rules.htm

Answer 5

Except for teh second, which is teh distributive prop

Answer 6

so dont uderstand

Answer 7

@Secret-Ninja @Compassionate

Answer 8

@12-teen

Answer 9

@Secret-Ninja

Answer 10

look hard huh

Answer 11

i really need help

Answer 12

@Tazmaniadevil

Answer 13

@paki

Answer 14

2. distributive law.
3. equals subtracted from equal, the remainders are equal.
4. equals divided by an equal, the quotients are equal.
5. the square root of equals are equal.

Answer 15

i still don't understand

Answer 16

ya i dont get that either

Answer 17

sorry micahm

Answer 18

@paki

Answer 19

@undeadknight26

Answer 20

Cant really do better than Studygal sorry mate.

Answer 21

will everything = 5-5

Answer 22

everything seems to = 5 or –5. @undeadknight26

Answer 23

@adr

Answer 24

@adrynicoleb

Answer 25

everything or the answer is x=5,-5 but that can't work for all so?

Answer 26

@sleepyjess

Answer 27

@amberxoxo

Answer 28

@adrynicoleb

Answer 29

@ashhhrodriguez

Answer 30

@adrynicoleb