Find the missing number 4 81 18 36 49 42 64 25 ?

Step-by-step explanation:

what happen you find the square root of the two number then you find their product

square root of 4=2

square root of 81= 9

hence, 9x2=18

therefore,

square root of 64= 8

square root of 25= 5

hence, 5x8= 40

giving us the next number

step-by-step explanation:

f(x)=2x^2 -1 

translation is a function transformation that transform the function in a way of translating. by translating the function its graph is moved  up an down. moving the function f(x) 2 units to the left will be the new function g(x) with the equation: g(x)=f(x+2)=2(x+2)^2 -1