4. a + ib form of complex number 9-i + 6 +1° -9 +i? is given by (a) 7-21 (b) 7+21 (c)-7-21 (d) - 7+21
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Answer:
Given, 3(7+7i)+i(7+i7)
=21+21i+7i+7i
2
=21+28i+7×(−1),[∵i
2
=−1]
=14+28i=a+ib,
where a=14,b=28
Step-by-step explanation:
hope it is right
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