each of two congruent sides of an isosceles triangle is 2n + 7 and the third side is 3n. write two equivalent expressions for the perimeter, also combine like terms to find the perimeter

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each of two congruent sides of an isosceles triangle is 2n + 7 and the third side is 3n. write two equivalent expressions for the perimeter, also combine like terms to find the perimeter

So one way we can do this is-

2(2n+7)+3n=

4n+14+3n=

7n+14

Another simpler way possible is-

2n+7+2n+7+3n=

RE-ORDER

2n+2n+3n+7+7=

COMBINE LIKE TERMS

7n+14

The perimeter of your isosceles triangle is equal to 7n+14 by combining like terms.

Hope this helps

P=2(2n+7)+3n

p=4n+14+3n

p=7n+14

p=7(n+2)

The equations could be

(2n+7)+(2n+7)+3n

or 2(2n+7)+3n

When we combined like terms it could be

4n+14+3n

2(2n+7)+2(3n) is incorrect because in a triangle there are 3 sides, the measure of two of the sides are 2(2n+7) and the third side is 3n however, he/she put "2(3n)" which would show there are 2 sides with the measure 3n