4x^2-9...please,
2007-09-16 11:21:03 · 8 answers · asked by mariacruztexas 1 in Science & Mathematics ➔ Mathematics
An equation requires an = sign.
4 x ² - 9 is not an equation , it is an expression.
4 x ² - 9 = (2x - 3) (2x + 3)
If it was an equation:-
2x - 3 = 0 , 2x + 3 = 0
x = 3 / 2 , x = - 3 / 2
2007-09-16 20:09:15 · answer #1 · answered by Como 7 · 1⤊ 0⤋
a^2 - b^2 = (a + b)(a -b)
the given expression can be written in this form
4x^2 - 9
here a = 2x and b = 3
(2x)^2 - (3)^2
= (2x + 3)(2x - 3)
2007-09-16 18:27:39 · answer #2 · answered by mohanrao d 7 · 0⤊ 0⤋
you have to find two numbers that will make 4x^2. so that is 2x. the same with -9. 3 mulitiplied by -3 gives you -9.
so...
(2x + 3)(2x - 3)
hope this helped =)
2007-09-16 18:27:08 · answer #3 · answered by Michelle S 1 · 1⤊ 0⤋
4x^2-9=(2x)^2-(3)^2
=(2x-3)(2x+3)------------using(a^2-b^2)=
(a-b)(a+b) ans
2007-09-16 18:28:20 · answer #4 · answered by MAHAANIM07 4 · 0⤊ 0⤋
(2x-3)(2x+3)=0
x=3/2 and -3/2
2007-09-16 18:27:13 · answer #5 · answered by dazed and confused 1 · 0⤊ 0⤋
(2x)^2 - (3)^2 = (2x + 3)(2x - 3)
2007-09-16 18:24:33 · answer #6 · answered by Anonymous · 0⤊ 0⤋
(2x-3)(2x+3)
2007-09-16 18:28:14 · answer #7 · answered by Harris 6 · 0⤊ 0⤋
(2x+3)(2x-3)
2007-09-16 18:24:33 · answer #8 · answered by Memories 4 · 0⤊ 0⤋