3 years ago

Each time Elena buys lunch at school, the balance on her school lunch account changes

Mathematics

1 answer:

77julia77 [94]3 years ago

7 0

Answer: -36 divided by -3

Step-by-step explanation:

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The difference between the solutions to the equation x2 =a is 30 what is a ?

Mademuasel [1]

Given equation is $x^2 = a$

In general solution of $x^2 = b$ is $x = + \sqrt{b}$ and $x = - \sqrt{b}$

So the solution of given equation is $x = + \sqrt{a}$ and $x = - \sqrt{a}$

Now difference between them is 30.
So we can write
$\sqrt{a} - (- \sqrt{a}) = 30$
$\sqrt{a} + \sqrt{a} = 30$
$2 \sqrt{a} = 30$
$\sqrt{a} = 15$

On squaring both side
$( \sqrt{a})^2 = (15)^2$
$a = 225$