Question

How cna you tell what number can you add to x^2-8x to get a perfect square trinomial?

The choices are:
a)9
b)12
c)16
d)64

(oh and can you also explain how you got this answer please?)

Answer 1

What is the x coefficient in this case?

Answer 2

um 1

Answer 3

That's the x^2 coefficient

Answer 4

oh, ok

Answer 5

So it's _______

Answer 6

Dewayne put a container of food at twenty-five degrees Celsius into the freezer until its temperature measured negative eighteen degrees Celsius. How much did the temperature of the food decrease?

seven degrees Celsius

eighteen degrees Celsius

twenty-five degrees Celsius

forty-three degrees Celsius

Answer 7

oh -8

Answer 8

Good, now take half of this x coefficient -8 to get ______

Answer 9

-4

Answer 10

Then finally square -4 to get (-4)^2 = ????

Answer 11

Remember to square all of it (even the negative)

Answer 12

16

Answer 13

That's your final answer

Answer 14

ohh, ok thank-you so much

Answer 15

So \(\Large x^2 - 8x + 16\) is a perfect square

Answer 16

you're welcome