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umka2103 [35]
3 years ago
15

What's the value of x ​

Mathematics
1 answer:
schepotkina [342]3 years ago
5 0
Answer: x=14

Explanation: the angle needs to equal the other angle, which is 63. To figure this out, we subtract 21 from 63. We get 42. 42 divided by 3 is 14. We are basically doing the equation in reverse.
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Here we have to use the formula.

The symmetry of a parabola x = -b/2a

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