SOLUTION: I need help with a few problems please.. 1.) x^2-8x=-12 2.)1/2x^2+4x=7 3.)0.25x^2-1.2x+3.2=0 and 4.) 5x^2=3.5+4.7x I need to solve these using the formula x= -b + or minus the

Algebra ->  Square-cubic-other-roots -> SOLUTION: I need help with a few problems please.. 1.) x^2-8x=-12 2.)1/2x^2+4x=7 3.)0.25x^2-1.2x+3.2=0 and 4.) 5x^2=3.5+4.7x I need to solve these using the formula x= -b + or minus the       Log On


   

Question 607427: I need help with a few problems please.. 1.) x^2-8x=-12 2.)1/2x^2+4x=7 3.)0.25x^2-1.2x+3.2=0 and 4.) 5x^2=3.5+4.7x I need to solve these using the formula x= -b + or minus the square root of b^2-4ac over 2a
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi

1.) x^2-8x=-12   OR x^2-8x+12 = 0

x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+

x+=+%288+%2B-+sqrt%28+16%29%29%2F%282%29+ x = 6 & x = 2

2.)1/2x^2+4x-7 =0

x+=+%28-4+%2B-+sqrt%2816%2B14%29%29+

x+=+%28-4+%2B-+sqrt%2830%29%29+