Question

упростите выражение (b+4)^2+(2b-5)*(2b+5)

Answer 1

(b+4)^2+(2b-5)*(2b+5) = b²+8b+16+4b²-25=5b²+8b-9

Answer 2

(b+4)²+(2b-5)*(2b+5) =  b² + 8ab + 16 + (4b² - 25) = b² + 8ab + 16 + 4b² - 25 + 5b² + 8ab - 9