2007-01-27 08:56:52 · 3 answers · asked by Play girl $ 2 in Science & Mathematics ➔ Mathematics
Please use parenthesis and brackets in the correct places. Do you mean: [5a(2a+6)] * [4a(3+6a)]?
First: elimiante parenthesis > use distribution - multiply the outer term with the terms in parenthesis...
[5a(2a) + 5a(6)] * [4a(3) + 4a(6a)]
[10a^2 + 30a] * [12a + 24a^2]
(10a^2 + 30a)(12a + 24a^2)
Sec: use the foiling method....
(10a^2)(12a)+(10a^2)(24a^2)+(30a)(12a)+(30a)(24a^2)
120a^3 + 240a^4 + 360a^2 + 720a^3
Third: combine "like" terms...
120a^3 + 720a^3 + 240a^4 + 360a^2
840a^3 + 240a^4 + 360a^2
*The expression has to be written in alpha descending order...
240a^4 + 840a^3 + 360a^2
2007-01-27 12:04:40 · answer #1 · answered by ♪♥Annie♥♪ 6 · 0⤊ 0⤋
5a(2a+6)4a(3+6a)?
= 20a^2(12a^2 + 42a + 18)
= 240a^4 840a^3+ 360a^2
2007-01-27 17:10:51 · answer #2 · answered by ironduke8159 7 · 0⤊ 0⤋
240a^4+820a^3+300a^2
2007-01-27 17:10:51 · answer #3 · answered by jamesdeen7 1 · 0⤊ 1⤋