Question

20x^2-30=4x solve for x

Answer 1

mmmm let me think about it

Answer 2

x=1.3288 or -1.1288

Explanation:

Given
`20x^(2)-30=4x`

Subtract 4x from both sides

`20x^(2)-4x-30=0`

Since we can factor out 2 from whole equation, let's factor out 2.

`2(10x^(2)-2x-15)=0`

Divide with 2 on both sides

`10x^(2)-2x-15=0`

We got the quadratic equation, we can solve for x using quadratic formula.

`x=\frac{-b\pm\sqrt{b^(2)-4ac} } {2a}`

`x=\frac{2\pm\sqrt{2^(2)-4X10X(-15)} } {2X10}`

`x=(2\pm√(604) )/(20)`

`x=(2\pm2√(151))/(20)`

`x=1.3288or-1.1288`