Question

Factor 2x2 − 24x + 72.
A. 2(x + 6)(x − 6)
B. 2(x + 6)2
C. 2(x − 6)2
D. Can't be factored

Answer 1

$2x^2-24x+72=2(x^2-12x+36)=2(x^2-2x\cdot6+6^2)=2(x-6)^2\\\\Answer:C.$