х² + 7 - 18 =0

To solve the equation x² + 7 - 18 = 0, we can first rearrange it to x² - 11 = 0.

Next, we can solve the equation by factoring:

x² - 11 = 0 (x + √11)(x - √11) = 0

Setting each factor equal to zero gives us two possibilities for x:

x + √11 = 0, which gives x = -√11 x - √11 = 0, which gives x = √11

So the solutions to the equation x² + 7 - 18 = 0 are x = -√11 and x = √11.