7 Answered Questions for the topic Sum And Difference

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... more

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... more

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... more

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 

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)=____

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... more

the sum of 11 and difference is 5

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