gee - real math is a lot easier to read
x^2+8x-7 = 0
x^2+8x+16 = 7+16
(x+4)^2 = 23
x+4 = ±√23
x = -4±√23
Now you try the 2nd one...
Solve the following quadratic equation by completing the square method;(a)x square plus 8x-7=0 (b) 5xsquare plus 5x=2
6 answers
No solve the first one to give you -8.80
5 x^2 + 5 x = 2 ? no, the answer is not 0
x^2 + x = 2/5
x^2 + x + 1/4 = 2/5 + 1/4 = (8 + 5)/20 =13/20
(x+1/2)^2 = 13/20
x + 1/2 = sqrt (13/20)
x = sqrt (13/20) - 1/2
or
x = - sqrt(13/20 - 1/2
x^2 + x = 2/5
x^2 + x + 1/4 = 2/5 + 1/4 = (8 + 5)/20 =13/20
(x+1/2)^2 = 13/20
x + 1/2 = sqrt (13/20)
x = sqrt (13/20) - 1/2
or
x = - sqrt(13/20 - 1/2
Anonymous the final answer is suppose to be 8.80
Anyone
Hi guys