Chemistry: Factorise 56 x squared y - 28xy squared

Factorise 56 x squared y - 28xy squared - id56287708701, Sk8terkaylee

ankomamasonjr

10.03.2021

$\huge\boxed{\text{A) -3}}$

Step-by-step explanation:

To find the value of this equation when x=-2 , we can substitute this value inside the equation and use PEMDAS to successfully find the value.

With the expression of 2x^2+4x-3 , let's substitute -2 in as x.

Now let's follow PEMDAS to solve this equation.

PEMDAS states that when solving an expression/equation, the order we must follow is

ParenthesesExponentsMultiplication/DivisionAddition/Subtraction

We can now solve for this.

We see that exponents come before multiply and dividing. Therefore:

$2(-2)^2 = 2 \cdot (-2)^2 = 2 \cdot 4 = 8$

So the value of our first term is 8.

Our second term will be $4 \cdot -2 = -8$ , and our last term will remain -3.

Adding these values together:

8 - 8 - 3 = -3

Therefore, the value of this expression when x = -2 is -3.

Hope this helped!

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