Multiply (-4i)(5i)(-7-7i)

Math
(-4i)(5i)(-7-7i)
Multiply (-4i)(5i).
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Multiply 5 by -4.
-20ii(-7-7i)
Raise i to the power of 1.
-20(i1i)(-7-7i)
Raise i to the power of 1.
-20(i1i1)(-7-7i)
Use the power rule aman=am+n to combine exponents.
-20i1+1(-7-7i)
Add 1 and 1.
-20i2(-7-7i)
-20i2(-7-7i)
Rewrite i2 as -1.
-20⋅-1(-7-7i)
Multiply -20 by -1.
20(-7-7i)
Apply the distributive property.
20⋅-7+20(-7i)
Multiply.
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Multiply 20 by -7.
-140+20(-7i)
Multiply -7 by 20.
-140-140i
-140-140i
Multiply (-4i)(5i)(-7-7i)
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