a) 3i
b) -10
c) 10i
d) 7i
2007-08-06 15:23:43 · 11 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
i*i = -1 becuase sqrt(-1)*sqrt(-1)
so 2*5*-1 = -10
B
2007-08-06 15:26:28 · answer #1 · answered by NKS 2 · 0⤊ 0⤋
2i * 5i = 10i^2 = 10(-1) = -10.
2007-08-06 22:25:57 · answer #2 · answered by Scarlet Manuka 7 · 0⤊ 1⤋
2i * 5i = 2*5*i^2 = 10 *(-1) = -10
B
2007-08-06 22:26:58 · answer #3 · answered by nyphdinmd 7 · 0⤊ 1⤋
2*5 = 10
i*i = -1
Answer: -10
2007-08-06 22:36:00 · answer #4 · answered by steiner1745 7 · 0⤊ 0⤋
2i * 5i = 10i^2
we know that i^2 is -1
so 10(-1) = -10
B
2007-08-06 22:28:58 · answer #5 · answered by 7 · 0⤊ 0⤋
i= a negative imaginary numer so they use -1 , so that means 2(-1)*5(-1)=-10
2007-08-06 22:40:45 · answer #6 · answered by Anonymous · 0⤊ 0⤋
2i * 5i = 10i^2 = -10
answer is (b)
2007-08-06 22:26:05 · answer #7 · answered by vlee1225 6 · 0⤊ 1⤋
its -10 because i^2=-1 in complex number theroy
2007-08-06 22:26:09 · answer #8 · answered by Jago 2 · 0⤊ 1⤋
10i
2007-08-06 22:27:05 · answer #9 · answered by Vicoy 2 · 0⤊ 1⤋
i^2 = -1
b)
2007-08-06 22:26:17 · answer #10 · answered by Anonymous · 0⤊ 1⤋