# How do you solve #-4x^2 + x^2 = -36#?

##### 1 Answer

Jul 4, 2016

#### Answer:

#### Explanation:

given:

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One way of calculating this

We know that

So

Write

Mathematically should be written as

'~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

So we know have:

But

Divide both sides by

Divide one negative number by another negative number and you have a positive answer.

But

Square root both sides