3 years ago

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Mathematics

1 answer:

zimovet [89]3 years ago

4 0

Answer:

5^11 = 5^3 * 5^8

5^11 = 5^0 * 5^11

5^11 = 5^-4 * 5^15

Step-by-step explanation:

These expressions equal 511 because each of them are the product of two powers that equal 511.

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Solve the Quadratic Equation By Completing the Square<br> b^2-15b-54=0

vladimir1956 [14]

$b^{2}-15b-54=0. \newline
b^{2}-15b=54. \newline
b^{2}-15b+(\frac{15}{2})^{2}=54+(\frac{15}{2})^{2}. \newline
(b-\frac{15}{2})^{2}=\frac{441}{4}. \newline
b-\frac{15}{2}=\pm\frac{21}{2}. \newline
b=\pm\frac{21}{2}+\frac{15}{2}. \newline
b_1 = -3, b_2 = 18.$