What is a method of calculating a result that is close to, but not exactly, the correct answer to a math problem

For the function, f(x) = -5x 2, find f(-4).

Which expression is equivalent to 2x^2+7x+4?

Which of the following describes the graph of y--4x-36 compared to the parent square root function? stretched by a factor of 2, reflected over the x-axis, and translated 9 units right stretched by a factor of 2, reflected over the x-axis, and translated 9 units left stretched by a factor of 2, reflected over the y-axis, and translated 9 units right stretched by a factor of 2, reflected over the y-axis, and translated 9 units left save and exit next submit