3Xsquared + 5X =0
I need to solve for X how can I do that if its squared I am lost please help
2006-12-18 06:57:23 · 5 answers · asked by icechampagne81 2 in Science & Mathematics ➔ Mathematics
3X^2 + 5X = 0
X(3X + 5) = 0
X = 0
and
3X + 5 = 0
X = -5/3
2006-12-18 07:05:24 · answer #1 · answered by Anonymous · 0⤊ 0⤋
You have to factor the equation.
3x^2 + 5x = 0
Factor out an x term:
x (3x+5)=0
Since the product of x and 3x+5 is zero, one or both terms must be zero.
So:
x=0 or x=-5/3
2006-12-18 07:00:13 · answer #2 · answered by Ooze90 3 · 1⤊ 0⤋
3x(squared) is three times 'x' times 'x';
5x is five times 'x';
We have "times 'x'" in each of the above, so you can factor it:
3x(squared) + 5x is equal to:
(3x + 5)(x).
So we have:
(3x + 5)(x) = 0.
Any number times zero is zero, so see that if 'x' is zero, the equation holds:
(3*0 + 5)(0) = 0.
The equation will also hold if (3x + 5) evaluates to zero,
so consider:
(3x + 5) = 0,
subtract five from both sides:
3x = -5,
divide both sides by three:
x = -5/3,
thus if 'x' is negative five-thirds, the equation will also hold:
( 3*-5/3 + 5 )( -5/3 ) = 0.
Hence the solution set is {0, -5/3} or you can say:
x = 0 or x = -5/3.
2006-12-18 07:04:30 · answer #3 · answered by Bugmän 4 · 0⤊ 0⤋
Factor!
This equals x * (3x + 5) = 0.
When a product equals zero, one of the two factors must be zero. So either x=0 (that's your first solution) or 3x+5=0 (work it out to get your 2nd solution).
2006-12-18 06:59:57 · answer #4 · answered by Anonymous · 0⤊ 0⤋
3xsquared stands fot3times2 which equals6
5xsquared equals5times2whichequals10
so you add 10&6 10&6=16
2006-12-18 07:04:34 · answer #5 · answered by crystal e 1 · 0⤊ 0⤋