A piece of paper is folded and punched as shown below.

If x, y and z are real numbers such that (x-5)²+(y-7)²+(z-9)²= 0 then (x+y+z) is equal to

if √1+x/121 = 13/11 then find the value of x.

If 2x + y = 15 and xy = 18, then the value of (4x² - y²)

The value of:

If a + b + c = 5, a³ + b³ + c³ = 95 and abc =15, then find the value of a² + b² + c² – ab –bc – ca

If a+1/a =9, then a⁵+1/a⁵ is equal to:

What is the simplified form of the expression?

(1 + x) (1 + x²) (1 + x⁴) (1 + x⁸) (1 – x)?

A.(1-x⁴⁰)