What is the expression -7x2 + 32x + 240 in factored form?

I believe the answer is -1 (7x-60)(x+4)

b) the dogs need to shift their focus to human scent.

a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers, and i is a solution of the equation x2 = −1. because no real number satisfies this equation, i is called an imaginary number. has no real solution, since the square of a real number cannot be negative.