Question

(b+3) × (b-3) - (b+5) × (b-5)?

Answer 1

(b+3) × (b-3) - (b+5) × (b-5)

(b² - 3b + 3b - 9) - (b²- 5b + 5b -25)

(b² - 9) - (b² -25)

b² - 9 - b² + 25

25 - 9

=16


Bons Estudos! ;)