Question

(-1)×(-5)×(-7)×(-2) answer me with step by step with formula. please

Answer 1

Answer:

+70.

Explanation:

First you might know the formula

+ × + =+.

- × - =+

+ × - = -

- × += -

so now we solve the problem

-1 ×-5 = (- × -)×(1×5)=+5

-7×-2 =(- × -)×(7×2)=+14

-1×-5×-7×-2= (-1 ×-5)×(-7÷-2)=+5 × +14 =+70.

So finally your answer = +70.