f(x) = 3x2 + 5x + 2
fprime(x) = 6x + 5
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(5x 2 - 8x + 1) + (2x 2 - 4x - 11)
2(3x + 4) + 5x - 2
5x - 3y -7x + 2y +3x = (5-7+3)x + (-3+2)y = x - y
3x-4=5x+6 gives: 2x=-10 which gives x=-5
if you meant 5x+9=3*15 then, 5x = 36, x = 7.2 if you meant 5x+9=3x+15 then, 2x = 6, x = 3