5^2-7^2 /5-7

Question

5^2-7^2 /5-7

hunus · Answer

Do you know the formula for difference of squares?

anonymous · Answer

5^2-7^2/5-7
5^2=25
25-7^2/5-7
7^2=49
25-49/5-7
5-7=-2
25-49/-2
25-49=-24
-24/-2
12

hunus · Answer

Also is that
$$\frac{5^2-7^2}{5-7}$$

anonymous · Answer

thanks Taz

anonymous · Answer

welcome :)

hunus · Answer

The formula for the difference of two squares says that the difference of two squares is equal to the sum of the two numbers multiplied by their difference.
$$(a^2-b^2)=(a+b)(a-b)$$

$$5^2-7^2=(5-7)(5+7)$$

So that the 5-7 factors cancel

$$\frac{(5-7)(5+7)}{5-7} = 5+7 = 12$$

anonymous · Answer

wowit seems pretty simple

hunus · Answer

Yup :)

anonymous · Answer

it is :) haha

hunus · Answer

Just try practicing some more. Work some extra problems and if you need help with them ask here :)

anonymous · Answer

im not good at algebra 2 what so ever i try and i try but i cant seem to understand it and im a senior in high school

hunus · Answer

Well whatever it is you need help with, if I'm on just shoot me an @hunus and I'll help

anonymous · Answer

i'll try to help as much as i can :) haha but i havent had algebra 2 yet

anonymous · Answer

thank sboth of you i really apreciate it

anonymous · Answer

anytime