<h3>Hey there! </h3><h3>You could simply solve this equation by doing PEMDAS </h3><h3>Parentheses </h3><h3>Exponents </h3><h3>Multiplication </h3><h3>Division </h3><h3>Addition </h3><h3>Subtraction </h3><h3>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~</h3><h3>
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</h3><h3>We have 
<u>negatives</u>, so this means we have a <u> positive result </u></h3><h3>
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</h3><h3>Answer/ Result: 
</h3><h3>Good luck on your assignment and enjoy your day! </h3><h3>~
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7th grade math help me pleasee
1 answer:
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Answer: x = 5
Step-by-step explanation:
The area of a rectangle is the length times the width. Since the dimensions are given as functions of x, youre going to have to use FOIL to combine them, then set that answer equal to the given value of 72.
l*w = (x+3)*(x+4) = x^2 + 7x +12 = 72
Subtract 72 on both sides. There is a reason why we'll do this instead of subtracting 12. The quadratic formula will help us to solve for x.
x^2 + 7x - 60 = 0
Apply the quadratic formula
We cant have a negative x value because that would result in negative dimensions and a negative area, which is impossible in this context. So you want to add the 17 instead of subtracting it.
x = 5 and x = -12
An alternate way is just factoring the trinomial to:
(x+12)(x-5) = 0