求 (-16) 的平方根
复数是可以表示为实数和虚数之和的术语。这些是可以写成 a + ib 形式的数字,其中 a 和 b 都是实数。它用 z 表示。这里值“a”称为实部,用 Re(z) 表示,“b”称为虚部 Im(z),以复数形式表示。它也被称为虚数。在复数形式中,a + bi 'i' 是一个称为“iota”的虚数。 i 的值为 (√-1) 或者我们可以写成 i 2 = -1。例如,
3 + 16i 是复数,其中 9 是实数 (Re),16i 是虚数 (Im)。15 + 20i 是复数,其中 10 是实数 (Re),20i 是虚数 (我是)
求 (-16) 的平方根
解决方案:
As we have discussed above about the complex number
Now as per the question to find the square root of (-16).
= √-16
= √16(-1)
= (√16)(√-1) {i = √-1}
= 4i
类似问题
问题1:求{-25}的平方根的值?
解决方案:
Given: √-25
= √-25
= √25(-1)
= (√25)(√-1) {i = √-1}
= 5i
问题2:求{-289}的平方根的值?
解决方案:
Given : √-289
= √-289
= √289(-1)
= (√289)(√-1) {i = √-1}
= 17i
问题 3:求 (9i) 的平方?
解决方案:
After squaring an imaginary number, it gives a result in negative …
(9i)2 = 9i × 9i
= 81i2
= 81(-1)
= -100
问题 4:简化 {(-3 – 5i) / (3 +2i)}?
解决方案:
Given {(-3 – 5i) / (3 +2i)}
Conjugate of denominator 3+2i is 3-2i
Multipy with the conjugate of denominator
Therefore {(-3 – 5i) / (3 +2i)} x {(3-2i) / (3-2i)}
= {(-3-5i)(3-2i)} / {(3+2i)(3-2i)}
= {-9 +6i -15i +10i2 } / {32 – (2i)2} {difference of squares formula . i.e (a+b)(a-b) = a2 – b2 }
= {-9 + 6i -15i + 10 (-1)} / {9 – 4(-1)} { i2 = -1 }
= {-9 + 6i -15i -10} / {9 + 4}
= (-19 – 9i) / 13
= -19 /13 – 9i /13
= -19/13 – 9/13 i
问题 5:简化给定的表达式 7/10i
解决方案:
Given: 7/10i
Stndard form of numerator, 7 = 7 +0i
Stndard form of denominator, 10i = 0 +10i
Conjugate of denominator, 0 + 10i = 0 – 10i
Multiply the numerator and denominator with the conjugate,
Therefore, {(7 + 0i) / (0 + 10i)} × {(0 – 10i)/(0 – 10i)}
= {7(0 – 10i)} / {0 – (10i)2}
= {0 – 70i} / {0 – (100(-1))}
= {-70i} / 100
= 0 – 70/100i
= -7/10i