2a(a – 5) + 4(a – 5) how do i solve

I do not under stand how you figure out what "a" is how do you figure it out?
in order of operations by

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1 Answer

2x(x-5) +4(x-5)=0

2x^2 -10x +4x -20=0

2x^2 -6x -20=0

x^2 -3x-10=0

(x-5)(x+2)=0
by

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