A welder is welding three pieces of metal to forn a trianglr. he has four pieces of metal to choose from. the four pieces measure 55in, 20 in, 18in, and 15in. which bar should he Not choose to use with two other pieces to forn a triangle? ​

idk

step-by-step explanation:

the polynomial is a perfect square trinomial of the form a^2-2ab+b^2:

option a. true

step-by-step explanation:

9x^2-12x+4

comparing with the form a^2-2ab+b^2

1.) a^2=9x^2

solving for a: square root both sides of the equation:

sqrt(a^2)=sqrt(9x^2)

a=sqrt(9) sqrt(x^2)

a=3x

2.) b^2=4

solving for b: square root both sides of the equation:

sqrt(b^2)=sqrt(4)

b=2

to be a perfet square trinomial 2ab must be equal to 12x. let's check:

2ab = 2 (3x) (2)

2ab = 12x

correct

htrhyjk

step-by-step explanation:

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true

step-by-step explanation:

it is more then likely a review to you prepare for an upcomign test or quiz