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leonid [27]
4 years ago
15

25) Solve by using square roots: (x + 3)2 = 49

Mathematics
2 answers:
polet [3.4K]4 years ago
3 0

Answer:

21.5

Step-by-step explanation:

jdjekekekekejeirhrjr

vredina [299]4 years ago
3 0

Answer:

x = 21.5

Step-by-step explanation:

(x + 3)2 = 49 \\  \\ 2x + 6 = 49 \\ 2x = 49 - 6 \\ 2x = 43 \\  \\ x =  \frac{43}{2}  \\  \\ x = 21.5

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Since BC is parallel to DE, triangles ABC and ADE are similar. What are the lengths of the unknown sides?
NikAS [45]

Answer:

C

Step-by-step explanation:

Step 1: find BC

Given Triangles ABC and ADE are similar,

\frac{AB}{AD} = \frac{BC}{DE}

BC = \frac{AB}{AD} x DE

= \frac{8}{8 + 4} x 9

= 6 cm

Step 2: use Pythagorean theorem to find AC and / or AE

Consider triangle ABC,

by Pythagorean theorem,

AB² + BC² = AC²

AC² = 6² + 8² = 100

AC = √100 = 10 (answer... we can see that C is the only one with AC=10.

Step 3: Verify.. even though we know that it is C because AC  = 10,  you can verify that the ansewer is correct by finding CE and confirming that CE=5

By using similar triangles ABC and ADE,

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5 0
3 years ago
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