7 Answered Questions for the topic Sum And Difference

07/29/18

#### the sum of two numbers is 13 and their difference is 7

how do i explain this to my 9 year old where we can all understand on how to get the answer without algebra because they don't even teach carrying the number in addition and without guessing a...
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01/28/18

#### Need Help Solving cos -105 with sum or difference identity

The question is cos -105. I know how to do the process for it but for some reason my answer doesn't have the right negatives.
I am getting:
√2 + (-√6)
--------------
4
The actual...
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01/26/18

#### Can't Solve -1-√3 * 1-√3 ------- ------ 1+√3 * 1-√3

I am doing sum and difference formulas with sin, cos, and tan. I am doing tan75 with the difference formula.
So tan 120-45
I have all the things found I just don't know how to multiply it...
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11/01/17

#### sum, difference, and product of two functions

suppose that the functions f and g are defined for all real numbers x as follows.
f(x)=3x^2
g(x)=x+4
(g - f)(x) = ____
(g + f)(x) = ____
(g * f)(2) = ____
Thanks! :D

11/01/17

#### sum, difference, and product of two functions

suppose that functions r and s are defined for all real numbers x as follows.
r(x)=3x-6
s(x)=6x
write the expressions for
(r - s)(x)=____
(r + s)(x)=____
(r * s)(-1)=____

11/01/17

#### sum, difference, and product of two functions

Suppose that the functions g and h are defined for all real numbers x as follows.
g(x)=2x
h(x)= 4x^2
Write expressions for
(g + h)(x)= ___
(the "." is supposed to be for...
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