Answer
$34$
Work Step by Step
Recall the acronym PEDMAS, which tells us the order of operations:
P: Parenthesis and other grouping symbols
E: Exponents
D/M: Division and Multiplication (from left to right)
A/S: Addition and Subtraction (from left to right)
Evaluate by substituting the given value of the variable and then using order of operations to simplify:
$=10^2-7(10) + 4
\\=100-70+4
\\=30 + 4
\\=34$
