x3 + 2x2 - 8x + 5 = 0 x(2x - 8) + 5 = 0
8x + 32 + 24 = 0 So 8x + 56 = 0 Subtract 56 from both sides: 8x = -56 Divide both sides by 8: x = -7
8x+9=9x-18+9 = 8x+9=9x-9 = 1x=0 (:
y = -16x2 + 342At the x-intercepts, y=0-16x2 + 342 = 016x2 = 342x2 = 342/16 = 21.375x = plus and minus sqrt(21.375) = approx. plus and minus 4.6233 (rounded)
x*x - 8x +16 = 0 x*x = 8x + 16 x - 16 = _/8x x_/-4 = 2 x = 2
- 8x + 8x = 0 so question is meaningless.
no
2x^2 + 8x + 3 = 0
x3 + 2x2 - 8x + 5 = 0 x(2x - 8) + 5 = 0
8x + 32 + 24 = 0 So 8x + 56 = 0 Subtract 56 from both sides: 8x = -56 Divide both sides by 8: x = -7
8x+9=9x-18+9 = 8x+9=9x-9 = 1x=0 (:
y = -16x2 + 342At the x-intercepts, y=0-16x2 + 342 = 016x2 = 342x2 = 342/16 = 21.375x = plus and minus sqrt(21.375) = approx. plus and minus 4.6233 (rounded)
If you can't factor it easily, use the quadratic formula.
x=0 y=2
x*x - 8x +16 = 0 x*x = 8x + 16 x - 16 = _/8x x_/-4 = 2 x = 2
dont know sorry
x2+8x = -3x2+5 4x2+8x-5 = 0 (2x+5)(2x-1) = 0 x = -5/2 or x = 1/2