If a+b=5 and a-b=3 find the value of a^2-b^2

If 1/√5+1/√5+1=p+q√r , find the values of p, q and r

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

What is the range of the function? f(x)=-2|x+1|? a. all real numbers. b. all real numbers less than or equal to 0. c. all real numbers less than or equal to 1. d. all real numbers greater than or equal to 1