Question

What are the zeros of the polynomial function: f(x) = (x + 4)(2x + 1)(x – 7)

Answer 1

Hint:

If ABC = 0, then A = 0, B = 0 or C = 0

So if

(x + 4)(2x + 1)(x – 7) = 0

then

x+4=0, 2x+1=0 or x-7=0

Answer 2

Solve each equation for x to get your 3 answers

Answer 3

but im not good in algebra.

Answer 4

x+4 = 0

x+4-4 = 0-4

x = -4

See how I got that?

Answer 5

yes can you keep explaining

Answer 6

2x+1=0

2x+1-1=0-1

2x=-1

2x/2 = -1/2

x = -1/2

So that's another zero

Answer 7

Note: a zero is another term for root (or solution) to an equation

Answer 8

Finally,

x-7=0

x-7+7=0+7

x=7

is the third zero (or root or solution)

Answer 9

So the three zeros are:

-4, -1/2, or 7

Answer 10

okay soo...
x-7=0
x-7+7=0+7
x=7 rightt?

Answer 11

you nailed it

Answer 12

that's one of the zeros

Answer 13

sweeeet i know how to do it now.

Answer 14

that's great :)

Answer 15

are you good in f(x)= ?