Question

упростите выражение (b+8)^2-2b(5b+8)

Answer 1

$(b+8)^2-2b(5b+8)\ b^2+16b+64 - 10b^2 -16b\ -9b^2+64$

Answer 2

$(b+8)^2-2b(5b+8) = b^2+16b+64-10b^2-16b=64-9b^2=\ =8^2-3^2b^2=(8+3b)(8-3b)$