Question

How do u do this? Thanks in advance!

Answer 1

You solve for x

start by expanding the (3x-7)²

12 = 2(3x - 7)(3x - 7) + 4
12 = 2(9x² - 42x + 49) + 4

multiply the 2 through
12 = 18x² - 84x + 98 + 4

combine all like terms, set equal to zero
18x² - 84x + 102 - 12 = 0
18x² - 84x + 90 = 0

use the quadratic equation

`x = \frac{-b +/- \sqrt{b^(2)-4ac } }{2a}`

Where
a = 18
b = -84
c = 90

then x = 3 and 5/3