PLEASE HELP DUE SOON FIRST GOOD ANSWER GETS BRAINLIEST show that x^2 + y^2 + z^2 = 3(2x-y) -1 is a sphere

Step-by-step explanation:

x² + y² + z² = 3(2x - y) - 1

x² + y² + z² = 6x - 3y - 1

x² - 6x + y² + 3y + z² = -1

(x - 3)² + (y + 1.5)² + z² = -12.25

(x - 3)² + (y + 1.5)² + z² = -(3.5)²

Since it follows the general equation form, it is a sphere.

after simplifying it i got: -36.25 as my answer. hope that !

7.25

step-by-step explanation:

we know that 7 equals to 7.0. we also know that 1/4=0.25. so we can add the two together and we get 7.25