Ineed aspa with these two ! < 3 give
1. classify the expression: 5x3 + 2x − 3
quadratic expression
linear expression
cubic expression
exponential expression
2. choose the expression that represents a quadratic expression.
12x4 − 2x3 + 5x2 − 9x − 6
2x3 + 5x2 − 9x − 6
12x2 + 8x − 1
−8x − 1

Part 1) Is a cubic expression

Part 2) The quadratic expression is 12x² + 8x − 1

Step-by-step explanation:

Part 1) Classify the expression: 5x³ + 2x − 3

we know that

Polynomials can be classified two different ways - by the number of terms and by their degree.

so

a) By the number of terms is a trinomial, because has three terms

b) By their degree The degree of the polynomial is found by looking at the term with the highest exponent on its variable

The highest exponent is 3 so this is a 3rd degree trinomial  

therefore

Is a cubic expression

Part 2) Choose the expression that represents a quadratic expression

we know that

If the expression is a quadratic equation , then the highest exponent of the variable is 2

therefore

The quadratic expression is 12x² + 8x − 1

(13/2,   -27/2)

Step-by-step explanation:

The midpoint is found by using

midpoint = (x1+x2)/2,  (y1+y2)/2

               = (15+-2)/2,  (-9+-18)/2

                 =13/2,   -27/2