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pychu [463]
3 years ago
12

Solve (-2x-1)(9x+2) Solve and show work

Mathematics
1 answer:
tresset_1 [31]3 years ago
3 0

Answer:

-0.5 or -2/9

Step-by-step explanation:

(-2x-1)(9x+2)

<em>o</em><em>p</em><em>e</em><em>n</em><em> </em><em>t</em><em>h</em><em>e</em><em> </em><em>b</em><em>r</em><em>a</em><em>c</em><em>k</em><em>e</em><em>t</em>

-18x² - 4x - 9x - 2

-18x²-13x-2

(18x²+9x)(+4x+2)

<em>f</em><em>a</em><em>c</em><em>t</em><em>o</em><em>r</em><em>i</em><em>s</em><em>e</em>

9x(2x+1) +2(2x+1)

(9x+2)(2x+1)

:<em>separate</em><em> </em><em>the</em><em> </em><em>bracket</em><em> </em><em>and</em><em> </em><em>equate</em><em> </em><em>to</em><em> </em><em>0</em>

9x+2=0

<em>collect</em><em> </em><em>like</em><em> </em><em>terms</em>

9x= -2

<em>divide</em><em> </em><em>through</em><em> </em><em>by</em><em> </em><em>9</em>

x= -2/9

or

4x = -2

<em>divide</em><em> </em><em>through</em><em> </em><em>by</em><em> </em><em>4</em>

<em>x</em><em> </em><em>=</em><em> </em><em>-</em><em>2</em><em>/</em><em>4</em>

<em>:</em><em> </em><em>x</em><em> </em><em>=</em><em> </em><em>-</em><em>0</em><em>.</em><em>5</em>

<em>answer</em><em> </em><em>=</em><em> </em><em>-</em><em>0</em><em>.</em><em>5</em><em> </em><em>or</em><em> </em><em>-</em><em>2</em><em>/</em><em>9</em>

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~

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