2007-04-30 12:53:27 · 6 answers · asked by noneb4noneafter 1 in Science & Mathematics ➔ Mathematics
(4r + 5)(4r - 5)
16r^2 - 20r + 20r - 25
16r^2 - 25
Answer: 16r^2 - 25
2007-04-30 12:57:35 · answer #1 · answered by skm4usa 3 · 0⤊ 0⤋
16r²-25
you simply foil,
4r*4r =4*4*r*r= 16r², 20r will be subtracted by 20r and 5*-5 =-25
2007-04-30 19:59:00 · answer #2 · answered by l0uislegr0s 3 · 0⤊ 0⤋
16r^2-25( the 20rand -20r cancel out)
2007-04-30 19:59:46 · answer #3 · answered by Dave aka Spider Monkey 7 · 1⤊ 0⤋
16r^2 -25 where r^2 means r squared.
General (a+b) (a-b) = a^2 - b^2
2007-04-30 19:59:20 · answer #4 · answered by Matt D 6 · 0⤊ 0⤋
16r^2-25
2007-04-30 19:57:55 · answer #5 · answered by usawatertech 1 · 0⤊ 0⤋
16(r squared) - 20r + 20r - 25
16(r squared) - 25
2007-04-30 19:58:08 · answer #6 · answered by xapatheticxkinzx 3 · 0⤊ 0⤋