−a2 − (2a − 7b) + b for a = −2 and b = 3

24

Step-by-step explanation:

Given

- a² - (2a - 7b) + b ← substitute a = - 2, b = 3 into the expression

= - (- 2)² - (2(- 2) - 7(3)) + 3

= - 4 - (- 4 - 21) + 3

= - 4 - (- 25) + 3

= - 4 + 25 + 3

= 24

 32

Steps: -(-2)2  -  [ 2(-2) - 7(3) ]  +  3

• Follow the PEMDAS order of operations

Calculate within parentheses  [ 2(-2) - 7(3) ] :   -25

= -(-2)2 -  (-25)  +  3

Multiply and divide (left to right):  4  -  (-25)  + 3

Add and subtract (left to right):    32

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