Free SAT Practice Question

Question 1 of 1
ID: SAT-PTAM-2
Section: Math - Passport to Advanced Math
Topics: Quadratic Equations; Absolute value
Difficulty level: Hard

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If $a$ and $b$ are non-zero integers such that $a^2+b^2-4a-2b=0$ and $a^2-b^2=0$, which of the following could be the value of $\left(a-b\right)$? (without calculator)

A$-3$
B$2$
C$3$
D$6$
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