Please Help

spel111

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Jun 25, 2005
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I need help with this.

Write a quadratic equation having given solutions: -4,7/5
 
Hello, spel111!

Write a quadratic equation having given solutions: -4, 7/5
You already know how to solve a quadratic equation by factoring, right?
Well, just run the problem backwards . . .

The answers were: . x .= .-4 . . . . . x .= .7/5

Then we have: . x + 4 .= .0 . . . . . 5x .= .7
. . . . . . . . . . . . . . . . . . . . . . . . 5x - 7 .= .0

Multiply the two equations: . (x + 4)(5x - 7) .= .0

. . . . . . . . . . . and we have: . x<sup>2</sup> + 13x - 28 .= .0 . . . . There!


If you read up the page, you'll see that it's <u>exactly</u> how we solve a quadratic.
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