9x2+x+64 9*64=576
To skip all this confusion, I graphed it and it does not have a solution.
When you graph it, it should cross the x-axis. When it does, the two places that it does is the solution.
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x2 + 12x - 64 = 0 ∴ (x + 16)(x - 4) = 0 ∴ x ∈ {4, -16}
64 + x2 = 196 Therefore, 196 - x2 = 64 x2 = 132 Therefore, x = sqrt(132). Rounded to three decimal places, this is equal to 11.489.
x2 + 5x + 3 = 9 x2 + 5x - 6 = 0 (x + 6)(x - 1) = 0 x = -6 or x = 1
x2-6x+9 = (x-3)(x-3) when factorised.
-(x - 9)(x + 2)