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What is X in (3x-12)° on question number 7?
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What is X in (3x-12)° on question number 7?

What is X in (3x-12)° on question number 7?-example-1
User CGN
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The exterior angle is equal to the sum of the opposite interior angles.
(4x+9) = (2x) + (3x-12)
4x + 9 = 5x - 12 . . . . . . . . collect terms
21 = x . . . . . . . . . . . . . . . .add 12-4x

Then the exterior angle is
(4·21+9)° = 93°
User Fernando Basso
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