Question

Evaluate: 9-3x2+4= step by step
A.6
B.7
C.15
D.16

Answer 1

is that = 0?

Answer 2

if so then -3x^2 = -4-9 ===> -3x^2=-13 ====> x^2 = -13/-3 ===> x = sqrt(13/3)

Answer 3

I have to find the answer I think it is B but I don't know if I am correct.

Answer 4

do you have a specific value for x?

Answer 5

Its a multiplication sign do you use x or * for that?

Answer 6

I keep trying to solve the problem but I always get -1 but I think the answer is b

Answer 7

oh ok hahaha next time just use * its alot clearer

Answer 8

9-3*2 +4 = 9 - 6 + 4 = you always do left to right = 3 + 4 = 7

Answer 9

use order of operations... multiplication before add
so
9-3x2+4
means do 3*2 = 6 so you have
9 - 6 +4
now add in order 9+ -6 (or 9-6 which means the same thing)
then add 4

Answer 10

Oh okay now I understand but why subtract 9-6 first the add 3+4? isn't addition first then subtraction?

Answer 11

when you have 9 - 6 +4 you would normally do it left to right

if you write the subtraction as adding a negative number, like this
9 + -6 + 4
then you are adding 3 numbers, and as you know you can switch the order when adding
1+2 is the same as 2+1, or 9 + -6 +4 is the same as 4+9 + -6


I always think of subtraction as adding a negative number...

Answer 12

Ooh THANK YOU I always would get this type of problem wrong :D

Answer 13

subtracting and adding are the same thing, and multiplying and dividing are the same thing so you if you have that then just go left to right

Answer 14

another way to think of your problem

9-3x2+4
is

9 + -3*2 + 4 (I switched to * because in algebra x stands for "unknown")

now it is still order of operations: multiply before add, but we do -3*2 = -6
and get
9 + -6 + 4
which gives 7 , just like before

Answer 15

I hope that doesn't confuse you