What is 15-[-5-(7-5)]-20 ?

The solution to 15-[-5-(7-5)]-20 is 2

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15-[-5-(7-5)]-20

15 - [- 5 - (7 - 5)] - 20

2

Solution steps

15 - [- 5 - (7 - 5)] - 20

Follow the PEMDAS order of operations

Calculate within parentheses

[- 5 - (7 - 5)] : - 7

- 5 - (7 - 5)

Calculate within parentheses

(7 - 5) : 2

7 - 5

7 - 5 = 2

= 2

= - 5 - 2

Add and subtract (left to right)

- 5 - 2 : - 7

- 5 - 2

- 5 - 2 = - 7

= - 7

= - 7

= 15 - (- 7) - 20

Add and subtract (left to right)

15 - (- 7) - 20 : 2

15 - (- 7) - 20

Apply rule

- (- a) = + a

- (- 7) = + 7

= 15 + 7 - 20

15 + 7 = 22

= 22 - 20

22 - 20 = 2

= 2

= 2

- 2 (- 1)^{2} + 5

7^{2} - 8^{2} + 7

(3 - 2^{2}) + 5

(2 + 6)^{2}

(4 \cdot 7)^{4}