Разложите ** множители 49-(5d+3)²

Question

Разложите на множители 49-(5d+3)²

Answer 1

49-(5d+3)²=7²-(5d+3)²=(7-(5d+3))(7+(5d+3))=(7-5d-3)(7+5d+3)=(4-5d)(10+5d)

Answer 2

49-(25d^2 +30d+9)
49-25d^2-30d-9