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murzikaleks [220]
4 years ago
8

What’s the answer? (2x+3)(2x-3)

Mathematics
1 answer:
Kisachek [45]4 years ago
5 0

Answer:4x^2-9

Step-by-step explanation:

By using the FOIL method we multiply 2x by 2x, 2x by -3, 3 by 2x, and 3 by -3.

After doing this we are left with 4x^2-6x+6x-9

The -6x and 6x cancel each other out leaving just 4x^2-9

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The extensions of the legs AB and CD of a trapezoid ABCD intersect at point E. Find the lengths of the altitude of △AED drawn to
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let's call G the intersection point of EF & BC.

according to the thales' theorem:

\frac{eg}{ef}  =  \frac{bc}{ad}

and EF= EG+GF=EG+3

\frac{eg}{eg + 3}  =  \frac{7}{21}

21eg = 7eg + 21

14eg = 21

eg =  \frac{21}{14}  =  \frac{3}{2}  = 1.5

length of the altitude of △AED=EF

EF=EG+GF=1.5+3=4.5

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