Answer:
12
Explanation:
Substitute x = 4 into the expression
4² - 3(4) + 8 = 16 - 12 + 8 = 12
x²-3x+8
Plug in:
(4)²-3(4)+8
Use PEMDAS:
P - Parentheses
E - Exponents
M - Multiplication
D - Division
A - Addition
S - Subtraction
16 - 3(4) + 8
16 - 12 + 8
4 + 8
Hope this helped.
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