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ikadub [295]
3 years ago
5

What is the formula of 2AB=2AB

Mathematics
1 answer:
MAVERICK [17]3 years ago
6 0

The only other possible meaning I can see is that a2 + b2 means a^2 + b^2. In the case that is a formula that cannot be simplified further, although it could be written as (a + b)^2 - 2ab or (a - b)^2 + 2ab. ... Originally Answered: What is the formula of a2+b2?

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4x2 + 9y2 = 72 x - y2 = -1 Select all of the following that are solutions to the system shown.
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You haven't listed the possible solutions, so in the immediate present I can help only by suggesting that you try solving this system and checking your own answers thru subst. into the given equations.

Please be sure to use "^" to indicate exponentiation, as shown below:

<span>4x2 + 9y2 = 72    should be 4x^2 + 9y^2 = 72 (this is the eq'n of an ellipse)
x - y2 = -1       should be x - y^2 = -1 (this is the equation of a parabola)

We must eliminate either x or y.  I will solve the 2nd equation for y^2 and subst. the result into the first eq'n.:

y^2 = x+1.  Subst. this into the first equation, 

</span>4x^2 + 9y^2 = 72 becomes 4x^2 + 9(x+1) = 72.

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We must solve this quadratic equation to obtain the x-coordinates of possible solutions of the original system of equations.
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Check out x=3.  We already have the relationship   y^2 = x+1.  If x = 3, then y^2 = 3+1 = 4, and y is plus or minus 2.

Two possible solutions of the original set of equations are thus (3,2) and (3,-2).  You MUST check both solutions thru substitution to determine whether they satisfy the original equations or not.
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What is the answer tom10t=90
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