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jonny [76]
3 years ago
6

The difference between the squares of two numbers is 20. three times the square of the first number increased by the square of t

he second number is 124. find the numbers
Mathematics
1 answer:
Mashcka [7]3 years ago
8 0
We need a system of equations to solve this.  "Difference" is to subtract, and we are taking this difference of the 2 squared unknowns to be 20.  That equation is x^{2} -y^2=20.  Our "first number is x^2, so 3 times that is 3x^2.  "Increased by" is adding to that first number.  What we are adding is the second number.  The second equation is 3x^2+y^2=124.  Let's solve the first equation for x^2: x^2=y^2+20 and sub that value for x^2 into the second equation.  3(y^2+20)+y^2=124 and 3y^2+60+y^2=124.  Subtract 60 from both sides and combine the y^2 terms to get 4y^2=64.  Divide both sides by 4 to get y^2 = 16 and y = 4.  Let's go back now and solve for x.  We will use the fact that y^2 = 16 to solve for x^2 and then take the square root of it.  x^2-16=20, x^2 = 4, so x = 2.  Your solutions are x = 2 and y = 4.  There you go!
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