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Elis [28]
2 years ago
11

How do I solve this?

Mathematics
1 answer:
vodomira [7]2 years ago
7 0
I’m assuming what you’re asking here is how to *factor* this expression. For that, let’s rearrange the expression into a more familiar form:

-c^2-4c+21

From here, we’ll factor out a -1 so that we have:

-(c^2+4c-21)

Let’s focus on the quadratic expression inside the parentheses. To find our factors (c + x)(c + y), we’ll need to find two terms x and y that multiply together to make -21 and add together to make 4. It turns out that the numbers -3 and 7 work out perfectly for that purpose (-3 x 7 = -21 and 7 + (-3) = 4), so substituting them in for x and y, we have:

(c + (-3))(c + 7)
(c - 3)(c + 7)

And adding back on the negative from a few steps earlier:

-(c - 3)(c + 7)
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(b) The area of a rectangular pool is 5488 m\2 If the length of the pool is 98 m, what is its width?​
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To find the area of a rectangle we have the foruma A=WxL.

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SInce its multiplying we do the opposite, so we divide 98 on both sides.

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