$~~~~x^2-6xy=z-9y^2\\\\\implies x^2- 2\cdot x\cdot 3y + (3y)^2 - (3y)^2 = z-9y^2\\ \\\implies (x-3y)^2 -9y^2 = z-9y^2\\\\\implies (x-3y)^2 = z\\\\\implies x - 3y =\pm\sqrt z\\\\\implies x = 3y\pm\sqrt z$

4 0

3 years ago

Find the value of X 150 4X-5

Nataliya [291]

Answer:

should i add 150 + 4x-5

Step-by-step explanation:

8 0

4 years ago

Combine like terms to create an equivalent expression. 7.4z−5(−1.6z+2.4)

ryzh [129]

Answer: $15.4z-12$

Step-by-step explanation:

For this exercise it is important to remember:

The Distributive property:

$a(b\±c)=ab\±ac$

The multiplication of signs:

$(+)(+)=+\\\\(-)(-)=+\\\\(-)(+)=-$

Then, given the following expression:

$7.4z−5(-1.6z+2.4)$

You need to apply the Distributive property. Then:

$=7.4z+8z-12$

Now you can combine like terms (or add the like terms). Then you get:

$=15.4z-12$

Therefore, the equivalent expression created by combining like terms, is:

$15.4z-12$

6 0

3 years ago