Plz help me to "resolve following into factors"
Q1: 4a²+12ab+9b²
Q2: 9x² - (2x-3y)²
Q3: (a+b-c)² - (a-b+c)²
Plz help me. tomorrow is my test.
2006-11-03 09:55:07 · 4 answers · asked by Cool 1 in Science & Mathematics ➔ Mathematics
The equations:
(a+b)^2=a^2+2ab+b^2
A^2-B^2=(A+B)(A-B)
James Chan's solutions were right.
2006-11-03 10:34:12 · answer #1 · answered by chanljkk 7 · 0⤊ 0⤋
For the hard ones like yur Q1, see the formal scheme at the link below.
2006-11-03 10:40:49 · answer #2 · answered by kindricko 7 · 0⤊ 0⤋
Q1 :4a2 + 12ab + 9b2 = (2a)^2 + 2* 2a * 3a + (3b)^2 = (2a+3b)^2
Q2 :9x2 - (4x2 - 12xy + 9y2) = 5x2 + 12xy - 9y2 = 5x^2 + 15xy - 3xy - 9y2 = 5x(x+3y) = - 3y(x + 3y) = (5x - 3y) ( x+3y)
Q3 : (a+b-c)2 - (a-b+c)2 = [a+b-c - (a-b+c)] [ a+b-c +(a-b+c)] = 4a(b-c)
2006-11-03 10:12:43 · answer #3 · answered by James Chan 4 · 0⤊ 0⤋
I have no idea, I'm only in 6th Grade!
SORRY!
2006-11-03 10:05:44 · answer #4 · answered by daytonaaaa(: 2 · 0⤊ 0⤋