x2 + 8x - 5 = 0
∴ x2 + 8x + 16 = 21
∴ (x + 4)2 = 21
∴ x + 4 = ± √21
∴ x = -4 ± √21
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x2 - 8x + 32 = 0 (assuming)you can factor or use the quadratic equation.I recommend the quadratic equation.
No.
- 8x + 8x = 0 so question is meaningless.
8x + 3 = 35 8x = 32 x = 4
8x + 8=40 8x=40-8 8x=32 x=32/8 x=4