Quadratics and Cubics, SMB-037

Using the quadratic formula, find `p` given

`p^2+2p-4 = 0.` (3 marks)

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`-1 +- sqrt(5)`

Show Worked Solution

`p^2+2p-4 = 0`

`text(Using)\ x = (-b +- sqrt( b^2-4ac) )/(2a)`

`p`	`= (-2 +- sqrt{(2)^2-4 xx 1 xx(-4) })/ (2 xx 1)`
	`= (-2 +- sqrt(20) )/2`
	`=(-2 +- 2sqrt(5) )/2`
	`= -1 +- sqrt(5)`