Question

Solve for x:using quadriatic formula x^2-2x-63=0

Answer 1

x = - 7

x = 9

Explanation:

`x=\frac{-b±\sqrt{b^(2)-4ac } }{2a}`

Ignore the A before the ±. It wouldn't let me type it correctly.

x² - 2x - 63 = 0

a = 1

b = - 2

c = - 63

`x=\frac{-(-2)±\sqrt{-2^(2)-4((-2)(-63)) } }{2(1)}`

`x=(-(-2)±√(4-4((-2)(-63)) ) )/(2(1))`

`x=(2±√(4+252 ) )/(2(1))`

`x=(2±√(256 ) )/(2(1))`

`x=(2±16 )/(2)`

Two separate equations

`x=(2+16 )/(2)`

`x=(2-16 )/(2)`

`x=(2+16 )/(2)`

`x=(18 )/(2)`

x = 9

`x=(2-16 )/(2)`

`x=(-14 )/(2)`

x = - 7

Answer 2

x=7 x=-9
hope this helps