Evaluate the expression when x= -5.2 and y = –6.8. 4x-7y

Mathematics

1 answer:

vfiekz [6]2 years ago

7 0

Step-by-step explanation:

Substitute variables with given values

Minus sign becomes plus sign if a negative is multiplied by a negative or a negative is put next to a negative number.

4x-7y=4(-5.2)-7(-6.8)

-20.8+47.6=26.8

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$\bf \textit{difference of squares}
\\ \quad \\
(a-b)(a+b) = a^2-b^2\qquad \qquad 
a^2-b^2 = (a-b)(a+b)\\\\
-------------------------------\\\\
\cfrac{2x}{x^2+2x-24}-\cfrac{x}{x^2-36}\quad 
\begin{cases}
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--------------\\
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\end{cases}$

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\begin{array}{llll}
\textit{thus our LCD is}\\
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\end{array}
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