Question

Evaluate the expression 12-3y 2 + sqrt 2y-4 y )for y=3

Answer 1

-15 +
`√(2)`

Explanation:

Given expression;

12 - 3y² +
`√(2y -4)`

Where y = 3;

Insert the given value of y;

12 - 3y² +
`√(2y -4)` = 12 - 3(3)² +
`√(2(3) - 4)`

= 12 - 27 +
`√(2)`

= -15 +
`√(2)`