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# Math problem justify each step?

A. 5x-4(x+10)=5x-4x-40

B. = 5x+(-4x)+(-40)

C. = [5+(-4)]x+(-40)

D. = 1x+(-40)

E. = 1x-40

F. = x-40

Can you justify each step by identifying property used? Thank you so much!

### 1 Answer

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- 8 years agoFavorite Answer
A. A(X+Y) = AX+AY

B. A-B-C = A+(-B)+(-C)

C. AX+BX+CY+DY+E+F = (AX+BX)+(CY+DY)+(E+F)

AX+BX = (A+B)X

A+(-B) = A-B because +(-) = -

D. Simplify

E. +(-) = -

F. 1X = 1*X = X because any thing times 1 equals 1

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