3 years ago

I have to factor this : 7x2+35x-49 im not sure what to do.

Mathematics

1 answer:

Anon25 [30]3 years ago

4 0

7(x^2 +5x-7)
i think this is how it works

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The diameter of a circle is 18 cm. Find its area in terms of pi

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If each person takes up 2.25 square feet of space, how many people can fit into an area that is 15 feet by 30 feet?

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2 years ago

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3 years ago

What are all of the real roots of the following polynomial? f(x) = x4 - 13x2 + 36

GREYUIT [131]

ANSWER

A. -3, -2, 2, and 3

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The given polynomial function is,

$f(x) = {x}^{4} - 13 {x}^{2} + 36$

To find the real roots, we equate the function to zero to obtain;

${x}^{4} - 13 {x}^{2} + 36 = 0$

We can solve this equation as a quadratic equation in
${x}^{2}.$

Thus we rewrite the equation as,

$({x}^{2})^{2} - 13 {x}^{2} + 36 = 0$

We split the middle term to get,

$({x}^{2})^{2} - 9 {x}^{2} - 4 {x}^{2} + 36 = 0.$

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We factor to get,

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Either

${x}^{2} - 9 = 0$
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$x=-3,-2,2,3$

The correct answer is A

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