Simplify 2x2 - y for x = 3 and y = -2. 10 16 20 14

Mathematics

2 answers:

RoseWind [281]3 years ago

6 0

Answer:

Step-by-step explanation:

Given

2x² - y ← substitute x = 3 and y = - 2 into the expression

= 2(3)² - (- 2)

= 2(9) + 2

= 18 + 2

= 20

goldfiish [28.3K]3 years ago

6 0

Answer: I hope one of the answers help because the equation inst put correctly so it can be either 14 or 10 check below for the equation order.

Step-by-step explanation:

First, you substitute the input variables for x and y.

$2^3(2)-2 =\\8(2)-2=\\16-2=14\\\\2(3)(2)-2=\\6(2)-2=\\12-2=10$

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ANSWER

The three expressions are

$V = 2(9 - {b}^{3} )(9 + {b}^{3} )$

EXPLANATION

We were given the volume in cubic units to

$V = 162 - 2 {b}^{6}$

If we factor 2, we get,

$V = 2(81 - {b}^{6} )$

The expression in parenthesis is a difference of two squares. But you may not recognize it at first sight.

$V = 2( {9}^{2} - ({b}^{3})^{2} )$

This further gives us.

$V = (2)(9 - {b}^{3} )(9 + {b}^{3} )$