Hi Happy New Year
thank you
everyone hope you all have had a good one........ I'm doing Maths on New Years Day
..... I'm having a bit of trouble with quadratic equations using a formula. I am using the formula to solve the equations but when I substitute the answers back in the equation the answers don't work....
This is the equation :
4²-3x-2=0
I use the formula :
x = -b ± √ b² - 4ac
_____________
2 a
I substitute the letters for the numbers in the formula so that it looks like
x = - - 3 ± √
( -3
)² - 4 x 4 x -2
_____________________
2 x 4
x = 3 + 4.80
________
8
or
x = 3 - 4.80
_________
8
Can someone please tell me where I'm going wrong
I am stating roots correct to 2 dp