Posted by margiee (: ! on Friday, October 24, 2008 at 11:50am.
There are 2 terms: 2x and (x+3).
If any term in a product is 0 the whole product is 0. So, what value of x would make 2x=0 and what value of x would make x+3 = 0?
Sorry, I meant to say factor not term.
If any "factor" in a product is 0 the whole product is 0.
There are 2 "factors".
i still don't understand , i'm sorry .
I am assuming that you need to find the values of x that will be true for the above.
When you multiply several items (each of these is called a factor) together the answer (called the product) is 0 if ANY of them are 0.
If any of them, a or b or c is 0, then multiplying them always gives 0.
The problem has 2 factors:
If either of these is 0 then 2x(x+3) is 0.
The answers are 0 and -3.
It is always a good idea to substitute back to check.
2(-3)(-3 + 3)
should have been
Aren't you supposed to solve these equations for x?
For #2, if
2x(x+3)=0, then either x = 0 or x = -3 will satisfy equation. Those are the solutions,
For #4, note that x^2 + 3x - 28 =
(x+7)(x-4). Since this is zero, then x = -7 and x = 4 satisfy the original equation, and are solutions
The two equations that you wrote for #5 are inconsistent. If the first one is correct, then what you need to do is factor 2x^2+9x-5
If that equals zero, then either factor is zero, and that tells you what x is.
mkay , thanks (:
so , what about number 3 ?
Factor y^2 + 8y = 0 into
y(y+8) = 0, and get the solutions from the factors. We are trying to teach you how to do these by yourself.
Rational Expression - (x+1/2x-1 - x-1/2x+1) * (2x-1/x - 2x-1/x^2) (x+1/2x-1 - x-...
math ; - 1. x^2 = 16 2. 2x(x+3) = 0 3. y^2 + 8y = 0 4. x^2 + 3x = 28 5. 2x^2 + ...
Math - Please show the solutions! 1.) x+y-2(2x-3y) 2.) x+y/2 - 3x-y/4 + x-5y/8 3...
Math - Can you check these questions for me? 1. Add: (3x^4-x+2)+(9x^5-x^2+x) 9x^...
derivative - I am finding the second derivative of (x^2)(y^3) = 1 2x(y^3) + (x^2...
Intermediate Algebra - Solve using the substitution method. Show your work. If ...
math-calculus - i think i do something wrong again(2x+1)/(x-3)-(4x-1)/(2x-3) = 0...
grade 9 math slope equations - question: slove by comparison and check your ...
algebra - Can someone please help me with this math problem? Thanks. Let g(x)=x^...
algebra - Reduce answers to lowest terms. 1.) 2x/2x^2+5x-3 + 5/x^2-9 = 2.) x-3/...
For Further Reading