What is the value of the function at x = -2?

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What is the size of the matrix resulting from

50 points and will mark brainlest if you were constructing a triangular frame, and you had wood in the length of 4inches, 4 inches, and 7 inches, would it make a triangle? would you be able to create a frame from these pieces of wood? yes or no? = explain your mathematical thinking:

What is the expression equivalent to (3x^2-7)