Answer:
-15 + [tex]\sqrt{2}[/tex]
Step-by-step explanation:
Given expression;
12 - 3y² + [tex]\sqrt{2y -4}[/tex]
Where y = 3;
Insert the given value of y;
12 - 3y² + [tex]\sqrt{2y -4}[/tex] = 12 - 3(3)² + [tex]\sqrt{2(3) - 4}[/tex]
= 12 - 27 + [tex]\sqrt{2}[/tex]
= -15 + [tex]\sqrt{2}[/tex]
