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4 votes
Please help me w/H.W please show the work​

Please help me w/H.W please show the work​-example-1
User Ezitoc
by
8.4k points

2 Answers

7 votes

1) 29

2) -15

//Hope this helps.

Please help me w/H.W please show the work​-example-1
User Ayumi
by
8.3k points
5 votes

Answer:

1). (3² - 4²) = 29

2). 5a - 7b + b² = -15

Explanation:

Points to remember

1) (a² - b²) = (a + b) (a - b)

Solve 22 - (3² - 4²)

To find (3² - 4²)

(3² - 4²) can be written as,

(3² - 4²) = (3 + 4 ) (3 - 4) = 7 * -1 = -7

22 - (3² - 4²) = 22 - (-7) = 22 + 7 = 29

22 - (3² - 4²) = 29

To solve 5a - 7b + b²for a = -1 and b= 5

Substitute the value of a and b in given expression we get,

5a - 7b + b² = (5 * -1) - (7 * 5) + 5²

= -5 - 35 + 25 = -15

Therefore 5a - 7b + b² = -15

User Phinz
by
7.9k points

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