x2+4x-9 = 5x+3
x2+4x-5x-9-3 = 0
x2-x-12 = 0
(x+3)(x-4) = 0
x = -3 or x = 4
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135
Do you mean y = 4x+9? If so then the y intercept is 9
The LCM (Least Common Multiple) of 2x7 and 4x9 is 36x63.
9
3x5 + 4x8 does not have a solution because it is not an equation. Are you looking for it's derivative? That would be: 15x4 + 32x7 Did you want it's indefinite integral? ∫(3x5 + 4x8) dx = x6/2 + 4x9/9 + C Or did you actually mean "three times five plus four times eight"? If so, the answer is 47.