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3 years ago

(_ −2a)2 = 9b2− _ + ___

Mathematics

1 answer:

marshall27 [118]3 years ago

7 0

Answer:

$\large\boxed{(3b-2a)^2=9b^2-12ab+4a^2}$

Step-by-step explanation:

$\text{Use}\ (a-b)^2=a^2+2ab+b^2\\\\(x-2a)^2=x^2-(2)(x)(2a)+(2a)^2=9b^2-\underline{\ \ \ \ }+\underline{\ \ \ \ }\\\\\text{Therefore}\ x^2=9b^2\\\\x^2=3^2b^2\\\\x^2=(3b)^2\to x=3b\\\\(3b-2a)^2=(3b)^2-(2)(3b)(2a)+(2a)^2=9b^2-12ab+4a^2$

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3 years ago

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3 years ago

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Arisa [49]

Answer:

The probability that a person is younger than 50 given that she uses onling banking is 1.5%

Step-by-step explanation:

The survey indicated that 50% of adults conducts their banking online.

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Of the total number of customer that bank online, the survey stated that 20% of them are younger than 50 years.

P(customers younger than 50 yrs) =1/5

Out of the 20% than are younger than 50, we were told that 15% of them conduct online banking.

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4 years ago

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zaharov [31]

$\left|x-\dfrac 12\right| = 3\dfrac 23\\\\\\\implies \left|x- \dfrac 12 \right| = \dfrac{11}3\\\\\\\implies x-\dfrac 12 = \dfrac{11}3 ~~~~~~~~~ \text{or}~~~~~~~ x - \dfrac 12 = - \dfrac {11}3\\\\\\\implies 2x -1 = \dfrac{22}3 ~~~~~~~~ \text{or}~~~~~~~~2x-1 =-\dfrac{22}3\\$

$\implies x =\dfrac 12\left(\dfrac{22}3 +1 \right) ~~ \text{or}~~~~~~~~ x = \dfrac 12 \left(1-\dfrac{22}3\right)}\\\\\\\implies x = \dfrac{25}6~~~~~~~~~~~~~~~ \text{or}~~~~~~~~ x=-\dfrac{19}6\\\\\\\implies x = 4\dfrac 16 ~~~~~~~~~~~~~~~ \text{or}~~~~~~~~x = -3\dfrac16$

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2 years ago

(___ −2a)2 = 9b2− ___ + ___

(_ −2a)2 = 9b2− _ + ___