4a to the fourth power -2b to the second power +40 when a =2 and b =7

Hi!

Let's set up the equation.



Put in the values...



Now solve using PEMDAS

Exponents


Subtract


Add


The answer is -72

Hope this helps! :)

X^2 - 4x +(4/2^2) + y^2 + 8y + (8/2^2) = -4 + (4/2^2) + (8/2^2)(x + 2)^2 + (y + 4)^2 = -4 + 4 + 16your center is (-2, -4) and the radius is the sqrt of -4 + 4 + 16 which is 4