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Sagot :
To find the absolute value of the complex number [tex]\(4 + 7i\)[/tex], we use the formula for the absolute value of a complex number [tex]\(a + bi\)[/tex], which is given by:
[tex]\[ \left| a + bi \right| = \sqrt{a^2 + b^2} \][/tex]
In this case, the real part [tex]\(a\)[/tex] is 4 and the imaginary part [tex]\(b\)[/tex] is 7. Follow these steps:
1. Square the real part:
[tex]\[ 4^2 = 16 \][/tex]
2. Square the imaginary part:
[tex]\[ 7^2 = 49 \][/tex]
3. Sum the squares of the real and imaginary parts:
[tex]\[ 16 + 49 = 65 \][/tex]
4. Take the square root of the sum to find the absolute value:
[tex]\[ \sqrt{65} \approx 8.06225774829855 \][/tex]
Thus, the absolute value of [tex]\(4 + 7i\)[/tex] is approximately [tex]\(8.06225774829855\)[/tex]. Therefore, the absolute value of [tex]\(4 + 7i\)[/tex] is equal to the square root of 65.
[tex]\[ \left| 4 + 7i \right| = \sqrt{65} \][/tex]
[tex]\[ \left| a + bi \right| = \sqrt{a^2 + b^2} \][/tex]
In this case, the real part [tex]\(a\)[/tex] is 4 and the imaginary part [tex]\(b\)[/tex] is 7. Follow these steps:
1. Square the real part:
[tex]\[ 4^2 = 16 \][/tex]
2. Square the imaginary part:
[tex]\[ 7^2 = 49 \][/tex]
3. Sum the squares of the real and imaginary parts:
[tex]\[ 16 + 49 = 65 \][/tex]
4. Take the square root of the sum to find the absolute value:
[tex]\[ \sqrt{65} \approx 8.06225774829855 \][/tex]
Thus, the absolute value of [tex]\(4 + 7i\)[/tex] is approximately [tex]\(8.06225774829855\)[/tex]. Therefore, the absolute value of [tex]\(4 + 7i\)[/tex] is equal to the square root of 65.
[tex]\[ \left| 4 + 7i \right| = \sqrt{65} \][/tex]
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