What are the zeros of f(x) = x2 + x - 20?

So when you use an equation like this, you use the PS2 method. P means you find the product of the first and last numbers in the equation, so in your problem it would be -20. S means the number in front of the 2nd number, and in your problem it would be 1 because anything times 1 is itself. The 2 means that you need to find two numbers that multiply to your product: -20, and the sum which is 1. And the two numbers are -4 and 5. And since it’s equal to zero, it’s x=-5 and x=4. Your welcome

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

i hope i you.