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Mathematics

1 answer:

Papessa [141]3 years ago

5 0

It’s definitely 100% B sorry if I’m late :)

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How do i solve x^2+7x=3x

valina [46]

To solve, you must make one side of the equation equal to zero. We can do this by subtracting 3x on both sides of the equation.

x^2 + 7x = 3x
 - 3x -3x

x^2 + 4x = 0.

Then we substitute the equation into the quadratic equation.

$\frac{-b+- \sqrt{b^2-4ac} }{2a}$

Where a = 1 b = 4 and c = 0

$\frac{-(4)+- \sqrt{(4)^2-4(1)(0)} }{2(1)}$

We first solve whats inside the square root.

$\frac{-(4)+- \sqrt{16} }{2(1)}$

$\sqrt{16} = 4$

Now we solve for -4 and 4.

$-4 - 4 = -8$
$-4+4=0$

Then divide both answer by 2

$\frac{-8}{2} = -4$
The division of any by zero is zero

So the answer are x = -4 and x = 0

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4 years ago

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What are the terms in the expression 7x+4y+1?

Vanyuwa [196]

Answer:

x and y are the terms think about the letters in the expression and those are the terms.

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3 years ago

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Find function domain f(x) = sqrt( 2sin x - 1 )

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