Solve 1+2-(-3-4)+5+6-(-7)-(-8)*(+9)

$$1 + 2 - ( - 3 - 4 ) + 5 + 6 - ( - 7 ) - ( - 8 ) \cdot ( + 9 )$$

Evaluate

$$100$$

Solution Steps

Add 1 and 2 to get 3.

$$3-\left(-3-4\right)+5+6-\left(-7\right)-\left(-8\times 9\right)$$

Subtract 4 from -3 to get -7.

$$3-\left(-7\right)+5+6-\left(-7\right)-\left(-8\times 9\right)$$

The opposite of -7 is 7.

$$3+7+5+6-\left(-7\right)-\left(-8\times 9\right)$$

Add 3 and 7 to get 10.

$$10+5+6-\left(-7\right)-\left(-8\times 9\right)$$

Add 10 and 5 to get 15.

$$15+6-\left(-7\right)-\left(-8\times 9\right)$$

Add 15 and 6 to get 21.

$$21-\left(-7\right)-\left(-8\times 9\right)$$

The opposite of -7 is 7.

$$21+7-\left(-8\times 9\right)$$

Add 21 and 7 to get 28.

$$28-\left(-8\times 9\right)$$

Multiply -8 and 9 to get -72.

$$28-\left(-72\right)$$

The opposite of -72 is 72.

$$28+72$$

Add 28 and 72 to get 100.

$$100$$

Factor

$$2^{2}\times 5^{2}$$