What is expand (9+1=-5)*(9-1-5) ?

The solution to expand (9+1=-5)*(9-1-5) is 28=-10

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expand (9+1=-5)*(9-1-5)

expand

(9 + 1 = - 5) \cdot (9 - 1 - 5)

28 = - 10

Solution steps

(9 + 1 = - 5) (9 - 1 - 5)

Distribute parentheses

9 \cdot 9 + 9 (- 1) + 9 (- 5) + 1 = 9 + 1 = (- 1) + 1 = (- 5) + (- 5) \cdot 9 + (- 5) (- 1) + (- 5) (- 5)

Apply minus-plus rules

+ (- a) = - a, (- a) (- b) = ab

9 \cdot 9 - 9 \cdot 1 - 9 \cdot 5 + 1 = 9 - 1 = 1 - 1 = 5 - 5 \cdot 9 + 5 \cdot 1 + 5 \cdot 5

Simplify

9 \cdot 9 - 9 \cdot 1 - 9 \cdot 5 + 1 = 9 - 1 = 1 - 1 = 5 - 5 \cdot 9 + 5 \cdot 1 + 5 \cdot 5 : 28 = - 10

28 = - 10

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v (0, 0) f (0, - \frac{1}{39})

1 \circ (3 x + 1)

\frac{( x + 8 y ) ( x + 3 y )}{( x + y )}

\frac{( v - 1 ) ^{3}}{v ^{2}}

What is expand (9+1=-5)*(9-1-5) ?
The solution to expand (9+1=-5)*(9-1-5) is 28=-10