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Gennadij [26K]
3 years ago
6

What is the area of these

Mathematics
1 answer:
trasher [3.6K]3 years ago
3 0

Answer:

5: 15in  6: 20in  7: 3in  8: 30in

Step-by-step explanation:

Area =1/2 BH so what you do is you multiply the base x the height, then divide by 2, and that is your answer. Hope this helps.

NOTE: Do not forget to add inches 2 after writing the answer. You will be marked wrong for it. Btw 2 = Squared.

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What is 2x^2+9x-18 in vertex form?
atroni [7]

Complete the square:

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2(<em>x</em>² + 9/2 <em>x</em> + 81/16 - 81/16) - 18

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If you're not familiar with the method, the idea is to get a quadratic from the standard form

<em>ax</em>² + <em>bx</em> + <em>c</em>

into its vertex form

<em>a</em> (<em>x</em> - <em>h</em>)² + <em>k</em>

where (<em>h</em>, <em>k</em>) is the vertex of the parabola associated with the quadratic.

Expand the vertex form to get

<em>a</em> (<em>x</em>² - 2<em>xh</em> + <em>h</em>²) + <em>k</em>

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-2<em>ah</em> = <em>b</em>

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In this case, <em>a</em> = 2, <em>b</em> = 9, and <em>c</em> = -18, so

<em>h</em> = -9/(2 • 2) = -9/4

<em>k</em> = 18 - 9²/(4 • 2) = -225/8

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Answer:

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