book Maths Puzzle Numerical Ability

Explain the process and show EACH step in the process of simplifying the following problems:
a. sqrt13 � sqrt5
b. sqrt5 � sqrt7 � sqrt3
c. sqrt3(sqrt3 + sqrt5)

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Hi
I have this hw due tomorrow. I really need the solution to this problem ASAP.
Thanks

Question:

let x,y belonging to Rm be fixed vectors. COnsider the
function
f(theta) Directions: Graph each function, i need the x and y coordinates for this equation i can graph them myself, but the both the x and y coordinates can't go over 6 or -6

f(x)=-5x sq