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14 June, 09:21

Can anyone solve 4x^2 + 12x - 40? you would have to find what multiplies to get - 40 but adds to get 12, but you do something with th 4x^2 as well

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  1. 14 June, 09:35
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    There's really nothing to solve, since there's no equation there.

    Perhaps you want that expression factored. We can do that.

    First, all 3 terms share a common factor of 4. Let's pull that out,

    and see what's left to be factored:

    4x² + 12x - 40 = 4 (x² + 3x - 10).

    Now, the expression left inside the parentheses looks

    like it might be a lot easier to handle.

    Here's what the whole expression looks like after the

    quadratic inside the parentheses is factored:

    4 (x² + 3x - 10) = 4 (x + 5) (x - 2).

    There it is. Understand ... we haven't changed anything,

    and we haven't solved anything. We only wrote the original

    expression in a different form. It's still just an expression that

    stands for a number, and we won't know the number until

    somebody tells us the value of 'x'.
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